Scientia Agricultura Sinica ›› 2021, Vol. 54 ›› Issue (15): 3198-3206.doi: 10.3864/j.issn.0578-1752.2021.15.005

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

Effects of Different Magnesium Supplies on the Growth and Physiological Characteristics of Oilseed Rape in Seeding Stage

WANG KunJiao(),REN Tao,LU ZhiFeng(),LU JianWei   

  1. College of Resources and Environment, Huazhong Agricultural University/Microelement Research Center, Huazhong Agricultural University, Wuhan 430070
  • Received:2020-10-12 Accepted:2020-11-30 Online:2021-08-01 Published:2021-08-10
  • Contact: ZhiFeng LU E-mail:1196341967@qq.com;zhifenglu@mail.hzau.edu.cn

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Abstract:

【Objective】 Revealing the effects of different magnesium (Mg) supplies on the growth of oilseed rape, and providing a theoretical basis for the scientific application of magnesium fertilizer. 【Method】 Hydroponic experiments with 12 contrasting Mg supplies were conducted to evaluate the effects of different Mg supplies on growth, nutrient accumulation, photosynthetic characteristics, assimilate transport, and ion homeostasis of oilseed rape seedlings, and the critical Mg concentration was established, which was suitable for rapeseed growth. 【Result】 With the increasing Mg supplies, the rapeseed shoot biomass initially increased and then peaked at a concentration of 1.0 mmol·L-1, and finally decreased when solution Mg continuous to increase. Here a biomass-based Mg concentration threshold where the relative biomass researched 95% of the maximum biomass was defined. It was indicated that the shoot Mg concentration of 0.4%-0.7% was suitable for rapeseed growth under hydroponic condition. Appropriate Mg nutrient supply promoted the growth of shoot and root of oilseed rape. Mg deficiency significantly decreased the leaf net photosynthesis rate, Rubisco enzyme activity, apparent electron transfer rate and maximum carboxylation rate, etc., and inhibited leaf carbohydrate transport and plant growth. Excessive Mg supply disturbed the potassium (K), calcium (Ca), and Mg balance, which ultimately reduced the leaf K and Ca uptake and limited the growth of oilseed rape. 【Conclusion】 Overall, the proper Mg nutrition increased the synthesis of photoassimilates, promoted the transportation and distribution of carbohydrates, ensured ion homeostasis, and in turn, promoted the growth of oilseed rape and seed yield.

Key words: oilseed rape, Mg nutrition, biomass, assimilate synthesis and transportation, ion homeostasis

Fig. 1

Effects of different magnesium supplies on leaf growth of oilseed rape during seedlings stage"

Fig. 2

Effects of different Mg supplies on shoot and root biomass and Mg concentration of oilseed rape during seedling stage ** indicates that the P value of the fitting equation is less than 0.01, and the validity of the equation is more than 99%"

Table 1

Effect of shoot magnesium concentration on shoot potassium and calcium concentration of oilseed rape during seedling stage"

植株部位
Each part of the plant		 镁缺乏
Mg lack		 镁适宜
Mg optimum		 镁过量
Mg excess
地上部 Shoot 镁浓度 Mgc (%) 0.08±0.01c 0.58±0.01b 0.82±0.03a
钙浓度 Cac (%) 3.38±0.49a 2.94±0.47b 2.63±0.53c
钾浓度 Kc (%) 4.61±0.80a 5.48±0.99a 5.00±0.77a
新叶 NL 镁浓度 Mgc (%) 0.10±0.01c 0.55±0.03b 0.78±0.07a
钙浓度 Cac (%) 3.14±0.16a 2.52±0.08b 2.51±0.05b
钾浓度 Kc (%) 5.56±0.28a 5.08±0.04b 4.47±0.24c
老叶 OL 镁浓度 Mgc (%) 0.06±0.01c 0.66±0.04b 0.97±0.07a
钙浓度 Cac (%) 3.44±0.17b 5.04±0.16a 3.33±0.02b
钾浓度 Kc (%) 4.32±0.25c 7.74±0.28a 6.22±0.36b

Table 2

Effect of Mg on the phenotype of shoot and root of oilseed rape during seedling stage"

表型特征
Phenotype		 镁缺乏
Mg lack
0.10		 镁适宜
Mg optimum
1.00
根生物量 BMroot (g/plant) 0.11±0.01b 0.33±0.05a
根平均直径 Root avgdiam (mm) 0.58±0.04b 0.78±0.10a
根长 Root length (cm) 877±121b 1121±169a
根尖数 Root tips 627±92b 948±177a
叶面积 LA (cm2) 504±7b 842±12a
地上部生物量 BMshoot (g/plant) 1.51±0.05b 2.19±0.07a

Table 3

Effect of Mg on the phenotype of shoot and root of oilseed rape during seedling stage"

供镁浓度
Magnesium supplies
concentration (mmol·L-1)		 表型
Phenotype		 叶位Leaf position
1
(下lower)		 2 3 4 5 6 7
(上upper)
缺乏Lack
0.10		 镁浓度 Mgc (%) 0.13±0.01* 0.16±0.01* 0.16±0.01* 0.24±0.01* 0.28±0.02* 0.33±0.04* —
叶面积 LA (cm2) 51±5* 87±3* 91±4* 104±4* 104±5* 66±5* —
叶片生物量 BMleaf (g DW/plant) 0.26±0.03 0.28±0.01* 0.30±0.02* 0.29±0.02* 0.25±0.02* 0.14±0.01* —
比叶重 LMA (mg·cm-2) 2.8±0.4* 2.9±0.3* 3.2±0.3* 2.8±0.1 2.7±0.1 3.9±0.3 —
淀粉浓度 Starchc (%) 4.1±0.2* 7.9±0.3* 8.2±0.1* 5.3±0.2* 4.7±0.2* 3.3±0.0* —
蔗糖浓度 Sugarc (%) 6.1±0.3* 5.1±0.3* 4.7±0.1* 3.2±0.1* 2.4±0.1* 3.3±0.1* —
适宜Optimum
1.00		 镁浓度 Mgc (%) 1.30±0.03 1.35±0.05 1.27±0.09 0.98±0.03 1.08±0.04 1.07±0.04 0.93±0.03
叶面积 LA (cm2) 113±12 155±4 160±4 139±5 126±4 93±4 56±2
叶片生物量 BMleaf (g DW/plant) 0.27±0.01 0.32±0.01 0.38±0.01 0.42±0.03 0.33±0.02 0.30±0.02 0.17±0.02
比叶重 LMA (mg·cm-2) 1.5±0.2 1.9±0.1 2.1±0.2 3.1±0.3 3.0±0.2 3.5±0.1 4.9±0.3
淀粉浓度 Starchc (%) 1.5±0.0 2.2±0.1 1.9±0.0 2.5±0.1 2.7±0.1 3.0±0.1 2.1±0.1
蔗糖浓度 Sugarc (%) 3.3±0.1 1.8±0.2 3.2±0.0 7.4±0.1 4.5±0.1 6.4±0.1 11.5±0.6

Table 4

Effect of Mg on leaf physiological and biochemical indexes of oilseed rape during seedling stage"

生理生化指标
Physiological and biochemical indexes		 上层叶片 Upper leaf 下层叶片 Lower leaf
镁缺乏 Mg lack 镁适宜Mg optimum 镁缺乏 Mg lack 镁适宜Mg optimum
净光合速率 A (μmol·m-2·s-1) 12.2±1.3b 16.4±1.4a 6.8±1.1b 16.6±1.8a
气孔导度 gs 0.14±0.02a 0.13±0.02a 0.08±0.03b 0.17±0.02a
胞间CO2浓度 Ci 246±8a 189±12b 285±11a 248±8b
叶绿素a含量 Chl a (mg·g-1 FW) 0.10±0.01b 0.76±0.06a 0.09±0.01b 0.49±0.04a
叶绿素b含量 Chl b (mg·g-1 FW) 0.10±0.01b 0.36±0.03a 0.07±0.01b 0.18±0.02a
叶绿素含量 Chl a+b (mg·g-1 FW) 0.20±0.01b 1.12±0.08a 0.16±0.02b 0.67±0.05a
实际光化学量子效率 ΦPSII 0.24±0.02b 0.29±0.02a 0.17±0.02b 0.24±0.02a
表观光合电子传递速率 ETR 122±9b 147±9a 85±9b 123±12a
Rubisco酶活性 Rubisco activity (U·g-1 FW) 228±10b 908±23a 99±6b 298±5a
最大羧化效率 Vcmax 19.66±2.84b 33.03±1.38a 16.20±2.37b 35.76±2.33a
最大电子传递速率 Jmax 18.27±2.72b 41.45±0.96a 16.01±2.20b 38.84±3.43a
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