Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (20): 4137-4151.doi: 10.3864/j.issn.0578-1752.2020.20.004

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Effects of Drought Stress During Jointing Stage on Spike Formation and Seed Setting of Main Stem and Tillers of Winter Wheat

LI Ping1(),SHANG YunQiu1,LIN Xiang1,LIU ShuaiKang1,WANG Sen1,HU XinHui1,WANG Dong1,2()   

  1. 1Shandong Agricultural University/State Key Laboratory of Crop Biology, Tai’an 271018, Shandong
    2Zibo HeFeng Seed Technology co., ltd., Linzi, Shandong, 255000, China
  • Received:2020-01-02 Accepted:2020-03-17 Online:2020-10-16 Published:2020-10-26
  • Contact: Dong WANG E-mail:sdauliping@163.com;wangd@sdau.edu.cn

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Abstract:

【Objective】To address the problem of low wheat yield and water efficiency caused by irregular distribution of natural precipitation season and the frequent rate of staged drought in the Huang-Huai-Hai Plain of China, this paper provided theoretical as well as technical provisions for water-saving cultivation of winter wheat in this area by exploring the effects of water insufficiency on the main stem and tiller spikes formation and panicles traits during jointing stage.【Method】A 2-year pot experiment under external rain conditions was carried out from 2017 to 2019 in winter wheat growth season, and the two winter wheat varieties of Shannong 29 and Heng 0628 were used as experimental materials. The total five water treatments were set up during 0-10 d after jointing, including full irrigation treatment during whole growing season as control (CK, maintaining soil relative water content of 75%-80%, the effective soil water content of 42.2-46.7 mm), 0-5 d light drought stress after jointing (T1, maintaining soil relative water content of 65%-70%, soil availability water content of 33.4-37.8 mm), 0-5 d severe drought (T2, maintaining soil relative water content of 45%-50%, available soil water capacity is 15.6-20.1 mm), 0-10 d light drought stress after jointing (T3, maintaining soil relative water content is 65%-70%, soil availability water content of 33.4-37.8 mm), and 0-10 d severe drought stress (T4, maintaining the soil relative water content 45%-50%, availability water content of 15.6-20.1mm).【Result】The results revealed that different degrees of drought stress had no significant effect on the main stem of wheat during 0-10 d after jointing, the effective spike rate of low tiller (Ⅲ, Ⅰp ) decreased rapidly with the increasing the drought level and extension of drought time, while the effective spike rate of high tiller (Ⅱp and Ⅰ1) increased first and then decreased. Light or severe drought at 0-5 d after jointing stage, Ⅱp and Ⅰ1 were higher in effective spike rate, and there was no significant difference in spike number per unit area from CK. Although the effective spike rate of Ⅰ1 and Ⅱp was similar to that of CK in 0-10 d light drought after jointing stage, the percentage of spikes per unit area decreased significantly due to the decrease of Ⅲ, Ⅰp and Ⅳ. The number of spike per unit area of Shannong 29 and Heng 0628 was decreased by 4.94%-5.06% and 6.77%-8.33%, respectively. For 0-10 d light drought after jointing, the effective rate of tiller of Ⅱ and more was decreased of severe drought. The number of spikes per unit area of Shannong 29 and Heng 0628 was decreased by 10.97%-11.52% and 15.00%-15.55%, respectively. The treatment of light drought at 0-5 d after jointing stage, the panicle characteristics, single stem grain yield and grain yield per unit area of the two cultivars were not significantly different from CK. The treatment of severe drought from 0 to 5 days after jointing, the fertile spikelets number and the grain number in the two cultivars were significantly reduced, and the main stem and later occurring tillers were not affected. The single grain weight of Shannong 29 was not affected, but the yield of single stem grain yield was significantly reduced, the single grain weight and single stem grain yield of Heng 0628 was significantly reduced, the grain yield per unit area of Shannong 29 and Heng 0628 decreased significantly, which was 5.14%-5.46% and 5.45%-6.24% lower than CK, respectively. For the light and severe drought from 0 to 10 days after jointing, the spikelets number, the fertile spikelets number, grain number, single grain weight, single stem grain yield and grain yield per unit area of the two cultivars were significantly reduced; The median tillers had substantial reduction; The number of grains per ear and the yield of single-stem grain and the grain yield per unit area of severely drought-treated stems were significantly lower than those of light drought treatment. Under the T3 condition, the grain yield per unit area of Shannong 29 and Heng 0628 was decreased by 12.87%-13.30% and15.52%-16.59%, respectively. Under the T4 condition, the grain yield per unit area of Shannong 29 and Heng 0628 decreased by 23.18%-25.92% and 26.05%-31.22%, respectively.【Conclusion】The above results indicated that short-term light drought after jointing (0-5 days after jointing, maintaining soil relative water content of 65%-70% and soil effective water content of 33.4-37.8 mm) had no significant effects on wheat earing and fruiting; The percent of tillers to panicle, the spikelets number, the fertile spikelets number, grain number, single grain weight and single stem grain yield of the low tillers (Ⅲ, Ⅰp) would be greatly reduced, and the grain yield per unit area was significantly reduced increased drought stress and time. However, the effective spike rate of high tillers (Ⅱp and Ⅰ1) in two degrees of 0-5 d after jointing and light drought training of 0-10 d after jointing was increased to some extent, which could make up for the loss caused by drought, which might be related to the decrease of the effective spike rate of low tillers, the decrease of population size, and the increase of nutrition and living space for high tillers. Shannong 29 had the stronger potential to adapt drought stress at jointing stage than Heng 0628.

Key words: winter wheat, phased drought, main stem and tillers, spike formation and seed setting, grain yield

Table 1

Spike developmental score of wheat"

幼穗发育时期及特征
Spike developmental stage and its characteristic		 发育阶段
Developmental score
生长锥伸长期 Transition apex 1.5
单棱期 Early double ridge stage 2
二棱期 Double ridge stage 2.5
颖片原基分化期 Glume primordium present 3
外稃原基分化期 Lemma primordium present 3.25
小花原基分化期 Floret primordium present 3.5
雄蕊原基分化期 Stamen primordium present 4
雌蕊原基分化期 Pistii primordium present 4.25
心皮原基分化期 Carpel primordium present 4.5
三心皮包围胚珠期 Carpel extending round three sides of ovule 5
花柱管闭合,子房仅顶部保持开放状态 Stylar canal closing; ovarian cavity enclosed on all sides but still open above 5.5
花柱管开口,柱头突起形成 Stylar canal remaining as a narrow opening; two short round style primordia present 6
花柱开始伸长 Style begin elongation 6.5
柱头上分化出柱头分枝 Stigmatic branches just differentiating as swollen cell on styles 7
柱头分枝和子房壁上羽毛伸长 Stigmatic branches and hairs on ovary wall elongation 8
柱头分枝和子房壁上羽毛继续伸长,柱头分枝缠绕无絮
Stigmatic branches and hairs on ovary wall continue to elongate; stigmatic branches from a tangled mass		 8.5
花柱和柱头分枝直立,羽状柱头分化 Styles and stigmatic branches erect; stigmatic hairs differentiating 9
花柱和柱头分枝向外展开,羽状柱头发育完全 Styles and stigmatic branches spreading outwards. Stigmatic hairs well developed 9.5
花柱向外弯曲,柱头分枝伸展,花粉落在羽状柱头上
Styles curved outwards and stigmatic branches spread wide; pollen grains an well-developed stigmatic hairs		 10

Table 2

Effects of staged drought at jointing on development process of young spike of main stem and tillers at different positions of wheat"

年份
Year		 品种
Cultivar		 处理
Treatment		 拔节0 d 0 days after jointing stage 拔节5 d 5 days after jointing stage 拔节10 d 10 days after jointing stage
O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1
2017-
2018		 山农29
Shannong29		 CK 5 4.5 4.25 4 4 4 3.5 3.5 6 5.5 5 5 5 4.25 4.25 4 7 7 7 6.5 6.5 6 6 5.5
T1 5 4.5 4.25 4 4 4 3.5 3.5 6 5.5 5.5 5 5 4.5 4.25 4 7 7 7 6.5 6.5 6 6 5.5
T2 5 4.5 4.25 4 4 4 3.5 3.5 6 5 5 5 4.5 4.5 4.25 4 7 7 6.5 6 6 6 6 5.5
T3 5 4.5 4.25 4 4 4 3.5 3.5 6 5.5 5.5 5 5 4.5 4.25 4 7 7 7 6.5 6.5 6.5 6 6
T4 5 4.5 4.25 4 4 4 3.25 3.25 6 5 5 5 4.5 4.5 4.25 4 7 7 6 6 6 6 5.5 5
衡0628
Heng0628		 CK 5 4.25 4 4 4 4 3.25 3.25 5.5 5.5 4.5 4.5 4.25 4.25 4 4 7 7 6.5 6.5 6.5 6.5 6 5.5
T1 5 4.25 4 4 4 4 3.25 3.25 5.5 5.5 4.5 4.25 4.25 4.25 4 4 7 7 6.5 6.5 6.5 6.5 6.5 5.5
T2 5 4 4 4 4 4 3.25 3.25 5.5 5 4.5 4.25 4.25 4 4 4 7 7 6.5 6.5 6.5 6 6 5.5
T3 5 4.25 4 4 4 4 3.25 3.25 5.5 5.5 4.5 4.25 4.25 4.25 4 4 7 7 6.5 6.5 6.5 6.5 6 5.5
T4 5 4.25 4 4 4 4 3.25 3.25 5.5 5 4.5 4.25 4.25 4 4 4 7 7 6.5 6 6 5.5 5.5 5
2018-
2019		 山农29
Shannong29		 CK 4.5 4.25 4 4 4 3.5 3.5 3.25 6 5.5 5 5 5 4.5 4.25 4.25 7 7 6.5 6.5 6.5 6 5.5 5
T1 4.5 4.25 4 4 4 3.5 3.5 3.25 6 5.5 5.5 5 5 4.5 4.25 4.25 7 7 6.5 6.5 6.5 6 5.5 5
T2 4.5 4.25 4 4 4 3.5 3.5 3.25 6 5 5 5 4.5 4.5 4.25 4 7 7 6.5 6 6 6 5.5 5
T3 4.5 4.25 4 4 4 3.5 3.5 3.25 6 5.5 5.5 5 5 4.5 4.25 4.25 7 7 6.5 6.5 6.5 6.5 5.5 5
T4 4.5 4.25 4 4 3.5 3.5 3.25 3 6 5 5 5 4.5 4.5 4.25 4 7 7 6.5 6 6 5.5 5.5 5
衡0628
Heng0628		 CK 4.25 4.25 4 4 4 4 3.25 3.25 6 5.5 4.5 4.5 4.25 4.25 4 4 7 6.5 6.5 6.5 6.5 6 5 5
T1 4.25 4.25 4 4 4 4 3.25 3.25 6 5.5 4.5 4.25 4.25 4.25 4 4 7 6.5 6.5 6.5 6.5 6 5.5 5
T2 4.25 4.25 4 4 4 4 3.25 3.25 6 5 4.5 4.25 4 4 4 3.5 7 7 6.5 6.5 6.5 6 5 5
T3 4.25 4.25 4.25 4 4 4 3.25 3.25 6 5.5 4.5 4.25 4.25 4.25 4 4 7 7 6.5 6.5 6.5 6.5 5 5
T4 4.25 4.25 4.25 4 4 4 3.25 3.25 6 5 4.5 4.25 4 4 4 3.5 7 7 6 6 6 5 5 5

Table 3

Effects of staged drought at jointing on percentage of ear bearing main stem and tillers at different positions of wheat (%)"

年份
Year		 品种
Cultivar		 处理
Treatment		 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1
2017-2018 山农29
Shannong29		 CK 100.00a 100.00a 100.00a 79.37a 68.89a 37.78a 22.22bc 17.78b
T1 100.00a 100.00a 100.00a 75.56ab 64.44a 40.00a 33.33a 26.67a
T2 100.00a 100.00a 97.78ab 73.33b 55.56b 35.56b 31.11ab 24.44ab
T3 100.00a 100.00a 95.56ab 68.89c 53.33b 33.33b 26.67abc 22.22ab
T4 100.00a 97.78a 93.33b 66.67c 48.89c 26.67c 20.00c 12.70c
衡0628
Heng0628		 CK 100.00a 100.00a 100.00a 75.56a 75.56a 40.00a 20.00a 17.78a
T1 100.00a 100.00a 97.78a 73.33a 73.33a 42.22a 26.67a 22.22a
T2 100.00a 100.00a 97.78a 68.89b 57.78b 35.56b 24.44a 22.22a
T3 100.00a 100.00a 95.24ab 66.67b 53.33bc 33.33bc 22.22a 20.00a
T4 100.00a 95.56a 91.11b 66.67b 40.00c 31.11c 17.78a 11.11b
2018-2019 山农29
Shannong29		 CK 100.00a 100.00a 98.41a 79.37a 52.38a 36.51a 11.11b 4.76b
T1 100.00a 100.00a 96.83ab 77.78a 55.56a 36.51a 20.63a 11.11a
T2 100.00a 98.41a 95.24ab 73.33b 50.79b 33.33b 17.46a 7.94ab
T3 100.00a 98.41a 93.65ab 69.84b 47.62c 31.75b 12.70b 4.76b
T4 100.00a 96.83a 92.06b 55.56c 46.03c 26.98c 7.94c 1.59c
衡0628
Heng0628		 CK 100.00a 98.41a 96.83a 71.43a 44.44b 39.68a 12.70b 6.35b
T1 100.00a 98.41a 95.24a 68.25ab 49.21a 39.68a 15.87a 12.70a
T2 100.00a 95.24a 93.65a 65.08b 44.44b 33.33b 12.70b 9.52b
T3 100.00a 95.24a 92.06ab 60.32c 41.27c 26.98c 12.70b 7.94b
T4 100.00a 93.65a 90.48b 57.14d 30.16d 20.63d 3.17c 1.59c

Table 4

Effects of staged drought at jointing on spikelet number of main stem and tillers at different positions of wheat (spikelets/spike)"

年份
Year		 品种
Cultivar		 处理
Treatment		 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1 平均单茎可见小穗数
Average visible spikelet number per spike
2017-2018 山农29
Shannong29		 CK 18.2a 18.1a 17.5a 17.1a 16.5a 16.3a 16.1a 15.7a 17.3a
T1 18.2a 17.9a 17.1a 16.9a 16.3a 16.1a 16.1a 15.5a 17.1a
T2 18.0a 17.7ab 17.0ab 16.6ab 16.0ab 15.9ab 15.8a 15.3a 16.9ab
T3 17.6a 17.2b 16.6b 16.2b 15.6b 15.4b 15.2b 14.9b 16.5b
T4 17.3a 17.0b 16.3b 15.9b 15.5b 15.4b 15.0b 14.8b 16.4b
衡0628
Heng0628		 CK 20.0a 19.3a 18.8a 18.2a 17.7a 17.0a 16.8a 16.5a 18.6a
T1 19.7a 19.0a 18.4a 17.8a 17.3ab 16.5a 16.6a 16.4a 18.2a
T2 19.4a 18.5ab 18.1ab 17.5ab 17.1ab 16.3ab 16.4a 16.1a 17.9ab
T3 19.3a 18.3b 17.6b 17.0b 16.5bc 15.9b 15.8b 15.6b 17.6b
T4 19.1a 17.9b 17.3b 16.7b 16.2c 15.8b 15.5b 15.4b 17.4b
2018-2019 山农29
Shannong29		 CK 19.5a 19.1a 17.9a 17.5a 17.2a 16.9a 16.7a 16.2a 18.2a
T1 19.4a 19.0a 17.8a 17.3a 17.1a 16.8ab 16.5a 16.0a 18.0a
T2 19.2a 18.8ab 17.4ab 17.1ab 16.7ab 16.4ab 16.3a 15.6a 17.8ab
T3 18.9a 18.2b 16.8b 16.6b 16.4b 16.1b 15.7a 15.4a 17.3b
T4 18.7a 17.8b 16.4b 16.3b 16.0b 15.8b 15.5b 15.4b 17.2b
衡0628
Heng0628		 CK 21.2a 20.6a 19.7a 19.5a 19.2a 18.5a 18.1a 17.4a 20.0a
T1 20.9a 20.5a 19.3a 19.1a 18.9ab 18.2a 17.9a 17.0ab 19.5a
T2 20.8a 20.1ab 19.0ab 18.9ab 18.5ab 17.9ab 17.4ab 16.8ab 19.4ab
T3 20.6a 19.4b 18.5b 18.4b 18.1b 17.4b 17.1b 16.5b 18.9b
T4 20.3a 19.0b 18.0b 17.9b 17.7b 17.1b 16.9b 16.2b 18.8b

Table 5

Effects of staged drought at jointing on fruiting spikelet number of main stem and tillers at different positions of wheat (spikelets/spike)"

年份
Year		 品种
Cultivar		 处理
Treatment		 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1 平均单茎结实小穗数
Average fruiting spikelet number per spike
2017-2018 山农29
Shannong29		 CK 17.9a 17.6a 16.7a 15.9a 14.8a 14.1a 13.8a 13.1a 16.3a
T1 17.7ab 17.4a 16.3ab 15.6ab 14.5ab 13.9ab 13.6a 13.1a 15.9ab
T2 17.5ab 16.9ab 15.8b 15.1b 14.0b 13.5b 13.3ab 12.6a 15.6ab
T3 17.1bc 16.5bc 15.5bc 14.8bc 13.9bc 13.3bc 12.7b 12.3b 15.3bc
T4 16.4c 15.9c 14.5c 14.0c 13.1c 12.6c 12.1c 11.5c 14.7c
衡0628
Heng0628		 CK 18.3a 17.3a 16.3a 15.7a 15.2a 14.5a 14.1a 13.5a 16.3a
T1 18.0ab 16.8ab 15.9ab 15.2ab 14.7ab 13.9ab 13.8a 13.3ab 15.8ab
T2 17.7ab 16.3ab 15.4b 14.7b 14.3b 13.7b 13.4ab 12.9ab 15.5ab
T3 17.4b 16.2bc 15.0bc 14.4bc 13.9bc 13.3bc 12.9bc 12.5b 15.2bc
T4 16.8b 15.3c 14.2c 13.7c 13.0c 12.7c 12.3c 11.8c 14.6c
2018-2019 山农29
Shannong29		 CK 19.2a 18.5a 17.4a 16.6a 15.6a 14.9a 14.6a 13.7a 17.3a
T1 19.1ab 18.4a 17.2ab 16.4ab 15.4ab 14.8ab 14.3a 13.3a 17.0ab
T2 18.7ab 17.8ab 16.5b 15.7b 14.7b 14.2b 14.0a 13.1a 16.5ab
T3 18.3b 17.5bc 15.9bc 15.4bc 14.4bc 13.8bc 13.5bc 12.6bc 16.1bc
T4 17.6b 16.7c 14.8c 14.7c 13.8c 13.4c 13.0c 12.2c 15.6c
衡0628
Heng0628		 CK 19.2a 18.1a 17.1a 16.5a 16.1a 15.4a 15.0a 14.3a 17.3a
T1 19.0a 17.9a 16.7ab 16.1ab 15.8ab 14.9ab 14.8a 14.0a 16.8ab
T2 18.5ab 17.2ab 16.1b 15.6b 15.2b 14.5b 14.3ab 13.6ab 16.5ab
T3 18.2b 16.8bc 15.4bc 15.1bc 14.8bc 14.0bc 13.7b 13.1bc 16.0bc
T4 17.3b 15.9c 14.7c 14.4c 14.0c 13.1c 13.0b 12.5c 15.6c

Table 6

Effects of staged drought at jointing on grain number of main stem and tillers at different positions of wheat (kernels/spike)"

年份
Year		 品种
Cultivar		 处理
Treatment		 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1
2017-2018 山农29
Shannong29		 CK 41.6a 37.4a 34.8a 32.2a 29.5a 27.7a 25.0a 22.8a
T1 40.9a 36.8ab 33.9ab 31.5ab 29.2ab 27.4ab 25.7a 23.0a
T2 40.6ab 35.3bc 32.4bc 30.1bc 27.8b 26.1b 24.0ab 22.0ab
T3 39.4b 35.0c 31.9c 29.6c 27.6b 26.0b 23.6b 21.5b
T4 37.3c 31.9d 29.1d 27.3d 25.3c 23.7c 22.2c 20.3c
衡0628
Heng0628		 CK 43.5a 40.8a 37.1a 34.8a 32.4a 29.0a 26.5a 25.6a
T1 42.4a 39.5ab 36.1ab 33.8ab 31.2ab 27.6ab 26.6a 25.5a
T2 41.5ab 38.2b 34.5bc 32.3bc 30.4bc 27.1b 25.2a 24.4a
T3 40.3bc 37.7b 34.0c 31.7c 29.6c 26.4b 24.8b 23.5b
T4 38.8c 34.4c 31.0d 28.9d 26.9d 24.0c 23.5c 22.2c
2018-2019 山农29
Shannong29		 CK 47.7a 43.6a 41.9a 38.9a 34.0a 31.9a 29.2a 27.2a
T1 47.2a 43.8a 41.3ab 38.2ab 33.8ab 31.3ab 28.9a 26.9a
T2 46.6ab 41.4b 39.3bc 36.7bc 32.1bc 30.1bc 28.4ab 26.3ab
T3 45.2b 41.3b 38.0c 35.3c 31.9c 29.2c 27.5b 25.1b
T4 42.4c 38.7c 35.6d 33.7d 29.4d 27.9d 26.0c 23.7c
衡0628
Heng0628		 CK 49.1a 45.3a 42.4a 39.1a 36.5a 33.1a 31.0a 28.6a
T1 48.5a 44.6ab 41.3ab 38.3ab 36.7a 32.5ab 31.1a 28.9a
T2 47.1ab 42.8bc 39.6bc 36.6bc 34.0b 30.9bc 29.4ab 27.5a
T3 45.6b 42.0c 38.4c 35.8c 33.4b 29.7c 28.5b 26.2b
T4 43.0c 39.5d 35.6d 32.4d 30.6c 27.6d 27.2c 24.3c

Table 7

Effects of staged drought at jointing on single-kernel weight of main stem and tillers at different positions of wheat (mg/kernel)"

年份
Year		 品种
Cultivar		 处理
Treatment		 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1
2017-2018 山农29
Shannong29		 CK 51.94a 50.34a 49.36a 48.17a 46.56a 45.46a 44.70a 44.00a
T1 50.83ab 49.50ab 48.32a 47.89a 45.34a 45.39a 43.85a 43.09ab
T2 49.85ab 49.12ab 47.89ab 45.93ab 44.57ab 44.05ab 43.17ab 42.54ab
T3 49.28b 47.91bc 46.06bc 44.16bc 43.01bc 42.35bc 42.11bc 41.72bc
T4 48.85b 46.05c 44.78c 43.21c 41.80c 40.92c 40.70c 40.33c
衡0628
Heng0628		 CK 45.27ab 43.70a 42.37a 42.33a 41.57a 40.67a 39.90a 39.30a
T1 46.43a 45.88a 43.57a 43.52a 42.05a 41.88a 41.51a 39.98a
T2 43.07b 41.38b 39.82b 39.30b 39.52b 38.59b 37.85b 37.06b
T3 43.00b 41.23bc 39.05bc 38.75bc 38.46bc 37.85bc 37.72b 36.11b
T4 41.95b 39.38c 37.82c 37.32c 37.15c 36.42c 35.67b 35.10b
2018-2019 山农29
Shannong29		 CK 50.77a 50.01a 48.28a 46.39a 45.60a 44.39a 43.20a 41.25a
T1 50.37a 48.26a 47.06a 45.44a 44.14a 43.07a 42.91ab 40.29ab
T2 49.16ab 47.83ab 46.32ab 44.48ab 43.56ab 42.65ab 41.30ab 39.33ab
T3 48.14bc 47.59bc 45.11bc 43.13bc 42.44bc 41.49bc 40.82b 39.04b
T4 46.91c 45.65c 43.62c 41.34c 40.80c 39.70c 38.50c 37.42c
衡0628
Heng0628		 CK 46.89ab 46.33a 45.11a 43.12a 41.21a 39.89a 39.72a 38.11a
T1 48.17a 47.81a 46.88a 44.50a 42.94a 40.74a 40.22a 38.23a
T2 45.45bc 44.05b 42.20b 40.31b 39.12b 37.71b 37.56b 36.05b
T3 44.79c 43.42bc 41.53bc 39.67bc 37.79bc 37.04bc 36.97bc 35.30bc
T4 43.39c 42.00c 40.23c 38.09c 36.78c 35.47c 35.25c 34.61c

Table 8

Effects of staged drought at jointing on grain yield of main stem and tillers at different positions of wheat (g/stem)"

年份
Year		 品种
Cultivar		 处理
Treatment		 O Ⅰ Ⅱ Ⅲ Ⅰp Ⅳ Ⅱp Ⅰ1 平均单穗产量
Average yield per spike
2017-2018 山农29
Shannong29		 CK 1.75a 1.54a 1.49a 1.21a 1.14a 1.03a 0.91a 0.86a 1.38a
T1 1.73a 1.51ab 1.42ab 1.16ab 1.10ab 1.00ab 0.94a 0.85a 1.33ab
T2 1.69ab 1.48bc 1.39bc 1.14bc 1.07bc 0.97bc 0.86ab 0.83ab 1.30bc
T3 1.63b 1.42c 1.32c 1.11c 1.03c 0.93c 0.83b 0.78b 1.26c
T4 1.55c 1.34d 1.03d 0.95d 0.91d 0.82d 0.78c 0.75c 1.15d
衡0628
Heng0628		 CK 1.65a 1.44a 1.37a 1.18a 1.05a 0.94a 0.88a 0.76a 1.28a
T1 1.67a 1.47a 1.38a 1.18a 1.07a 0.96a 0.90a 0.79a 1.30a
T2 1.59ab 1.33b 1.26b 1.09b 0.97b 0.86b 0.83ab 0.73ab 1.21b
T3 1.52b 1.28b 1.21b 1.04b 0.92b 0.81b 0.75b 0.66b 1.16b
T4 1.38c 1.16c 0.92c 0.91c 0.83c 0.74c 0.70c 0.59c 1.03c
2018-2019 山农29
Shannong29		 CK 1.97a 1.75a 1.62a 1.37a 1.29a 1.06a 0.93a 0.86a 1.58a
T1 1.98a 1.72ab 1.59ab 1.36ab 1.29ab 1.05ab 0.91a 0.85a 1.54ab
T2 1.92ab 1.67bc 1.53bc 1.30bc 1.22bc 1.00bc 0.89ab 0.82ab 1.50bc
T3 1.85b 1.60c 1.46c 1.23c 1.17c 0.95c 0.85b 0.79b 1.45c
T4 1.77c 1.54d 1.23d 1.14d 1.04d 0.89d 0.79c 0.76c 1.37d
衡0628
Heng0628		 CK 1.86a 1.69a 1.54a 1.32a 1.17a 0.97a 0.88a 0.80a 1.50a
T1 1.91a 1.74a 1.55a 1.35a 1.17a 0.99a 0.91a 0.81a 1.50a
T2 1.80ab 1.60b 1.41b 1.20b 1.08b 0.90b 0.84ab 0.76ab 1.41b
T3 1.73bc 1.54b 1.34b 1.15b 1.03b 0.86b 0.80b 0.73b 1.35b
T4 1.67c 1.47c 1.15c 1.04c 0.95c 0.80c 0.72c 0.69c 1.31c

Table 9

Effects of staged drought at jointing on yield and its component factors of wheat"

处理
Treatments		 2017-2018 2018-2019
穗数
Spike per
pot		 穗粒数
Kernel per spike		 千粒重
1000-kernel
weight (g)		 产量
Yield
(g/pot)		 穗数
Spike per
pot		 穗粒数
Kernel per spike		 千粒重
1000-kernel
weight (g)		 产量
Yield
(g/pot)
山农29
Shannong29		 CK 47.34a 34.17a 45.97a 65.50a 43.43ab 40.91a 46.69a 68.48a
T1 48.60a 33.52ab 44.98a 64.67a 44.86a 40.05ab 46.22a 68.87a
T2 46.60ab 32.22b 44.05ab 60.79b 42.89ab 38.76b 45.03ab 64.86b
T3 44.80b 31.87b 42.97b 56.78c 41.29b 38.17b 43.70b 59.67c
T4 42.20c 29.84c 42.05b 48.52d 38.43c 36.26c 42.85b 52.60d
衡0628
Heng0628		 CK 47.60a 36.52a 43.77a 61.61a 42.29a 42.09a 46.51a 63.22a
T1 48.20a 35.34ab 44.72a 62.46a 43.14a 41.16ab 47.01a 64.63a
T2 45.80ab 34.42b 41.57b 55.19b 40.86ab 39.72bc 43.76b 57.46b
T3 44.17b 34.82b 40.27b 51.14c 39.57b 38.92c 42.97bc 53.41c
T4 40.80c 31.75c 39.35b 42.17d 37.22c 37.02c 41.24c 46.75d
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