Scientia Agricultura Sinica ›› 2019, Vol. 52 ›› Issue (16): 2768-2775.doi: 10.3864/j.issn.0578-1752.2019.16.003

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

Effects of Spectral Distribution on Photosynthetic and Chlorophyll Fluorescence Characteristics of Flag Leaves at Grain Filling Stage in Rice

LI JiangPeng1,LIU HaiJun2,HUANG ZhiWu1,LIU XiaoYing1,YOU Jie1,XU ZhiGang1()   

  1. 1 College of Agriculture, Nanjing Agricultural University, Nanjing 210095
    2 Wangcheng Agricultural Technology Service Center, Changsha 410200
  • Received:2019-01-25 Accepted:2019-07-03 Online:2019-08-16 Published:2019-08-21
  • Contact: ZhiGang XU E-mail:xuzhigang@njau.edu.cn

Abstract:

【Objectives】 The study was aimed to explore the effects of different spectra on the photosynthetic and chlorophyll fluorescence characteristics of flag leaves in rice at grain filling stage. 【Method】 The rice (Oryza sativa L. cv. Huageng 5) was planted under four different light conditions, including red light of 660 nm (R660) and 630 nm (R630), blue light of 460 nm (B460) and 440 nm (B440) combined with a special plant lamp (W), and the photosynthetic and chlorophyll fluorescence characteristics of rice leaves were determined at grain filling stage. 【Result】 Compared with red light (R660+W and R630+W), blue light (B460+W and B440+W) could increase the maximum photochemistry efficiency (Fv/Fm), actual photochemical efficiency (ΦPSⅡ), electron transfer efficiency (ETR), non-photochemistry quenching (NPQ) and photochemical quenching (qP). The net photosynthetic rate in the late stage of grain filling under B460+W was higher than that under red light. Compared to those of other treatments, the panicles per unit area under R660+W were the greatest, but the 1000-grain weight and seed setting rate were both higher under B460+W. In addition, B460+W also increased the maximum net photosynthetic rate (Pnmax), initial slope of light response curve (α), quantum efficiency of dark respiration, compensation point quantum efficiency, eigen-absorption cross-section of photosynthetic pigment molecule (σik) and number of light-harvesting pigment molecule (No). 【Conclusion】 The stable in photosynthetic rate of flag leaves under the addition of 460 nm blue light conditions was mainly attributed to increase ФPSII, contributing to accumulate dry matter, finally improved the 1000-grain weight and seed setting rate of rice.

Key words: spectral distribution, fitting of light response curve, rice 1000-grain weight, fluorescence parameter, photosystems II

Fig. 1

Spectral distribution of light treatments"

Table 1

Effects of spectral distribution on yield and its components"

处理
Treatment
穗数
Spike number (m-2)
穗粒数
Grain number per spike
千粒重
1000-grain weight (g)
结实率
Seed setting rate (%)
产量
Yield (kg·m-2)
R660 129.38±9.31a 42.6±2.58a 28.6±0.10a 90.23±0.22c 0.142
R630 106.99±4.98b 36.8±3.02a 28.0±0.20b 93.68±0.29a 0.103
B460 104.50±3.05b 41.3±2.58a 28.9±0.12a 94.57±0.33a 0.118
B440 114.45±7.25ab 41.8±2.94a 27.9±0.12b 92.79±0.34b 0.124

Fig. 2

Light response curve of photosynthesis for rice with different spectral distribution"

Table 2

Related photosynthesis parameters of light response curve"

光合参数
Photosynthesis parameter
处理 Treatment
R660 R630 B460 B440
光响应曲线初始斜率 Initial slope of light response curve, α, mol·mol-1 (×10-2) 4.73 4.14 5.81 3.03
光抑制项 Photo-inhibition term, β, (m2·s)/天线色素分子-1 (×10-5) 5.75 5.23 6.65 13.5
光饱和项 Photo-saturation term, γ, (m2·s)/天线色素分子-1 (×10-3) 1.90 1.70 1.50 0.90
暗呼吸的量子效率 Quantum efficiency of dark respiration (×10-2) 5.03 4.44 6.16 3.22
补偿点的量子效率 Compensation point quantum efficiency (×10-2) 4.45 3.86 5.48 2.85
捕光色素分子的本征光能吸收截面
Eigen-absorption cross-section of photosynthetic pigment molecule, σik, m2 (×10-20)
4.25 3.49 4.86 3.46
捕光色素分子数 Number of light-harvesting pigment molecule (No) (×1014) 5.89 6.28 6.33 4.63

Table 3

Effects of spectral distribution on chlorophyll fluorescence parameters"

指标Index R660 R630 B460 B440
最大光化学效率Fv/Fm 0.811±0.002b 0.814±0.001ab 0.819±0.002a 0.818±0.002aa
光下最大光化学效率Fv'/Fm' 0.591±0.025aa 0.608±0.018a 0.555±0.005a 0.591±0.010a
实际光化学效率ΦPSⅡⅡ 0.436±0.023ab 0.406±0.010b 0.434±0.003ab 0.469±0.009a
电子传递速率ETR 124.17±6.66abab 115.18±2.95b 123.41±0.89ab 133.17±2.72a
非光化学淬灭NPQ 0.805±0.117bb 1.030±0.150ab 1.238±0.056a 1.008±0.049ab
1-qP 0.263±0.014bb 0.328±0.031a 0.217±0.008bc 0.208±0.006c
光化学淬灭系数qP 0.737±0.014bb 0.672±0.031c 0.783±0.008abb 0.792±0.006a

Fig. 3

Effect of spectral distribution on net photosynthetic rate of rice flag leaves The above significant differences are in the same period"

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