| 钾营养对冬小麦光合作用和衰老的影响 |
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| 引用本文： | 于振文,张炜.钾营养对冬小麦光合作用和衰老的影响[J].作物学报,1996,22(3):305-312. |
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| 作者姓名： | 于振文 张炜 |
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| 作者单位： | 山东农业大学农学系，山东泰安，271018 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 盆栽砂培和田间试验结果表明，供钾不足使小麦生育后期旗叶过氧化物酶活性和丙二醛含量增高，可溶性蛋白质、叶绿素含量和根系活力降低，旗叶光俣速率下降，加速衰老。
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| 关 键 词： | 冬小麦 钾 营养 光合作用 衰老 小麦 |
| 收稿时间： | 1994-09-07 |
| 修稿时间： | 1995-02-25 |
Effect of Potassium on Photosynthesis and Senescence in Winter Wheat |
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| Yu Zhenwen Zhang Wei Yue Shousong Shen Chengguo Yu Songlie.Effect of Potassium on Photosynthesis and Senescence in Winter Wheat[J].Acta Agronomica Sinica,1996,22(3):305-312. |
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| Authors: | Yu Zhenwen Zhang Wei Yue Shousong Shen Chengguo Yu Songlie |
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| Institution: | Agronomy Department,Shandong Agricultural University,Taian,27108 |
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| Abstract: | Pot-sand culture and field experiment with different potassium level were car-ried from 1991????1993 to study the effect of potassium on photosynthesis and senescence in winter wheat. The results indicated that in flag leaves potassium deficiency caused are markable decrease in both chlorophyll and soluble protein contents, a sharp decline in root vigour and photosynthetic rate during grain filling period. While the peroxidase(POX)activity and malondialdehyde(MDA) content of flag leaves increased in response to potassium deficiency. A phenomenon characteristic of senescing tissues arised more early and seriously in K-deficiency plant than K-adequate supply plant.Under the condition of K-deficiency,the supplement of K increased the leaf chlorophyll content , stomatal conductance, root vigour, photosynthetic rate and CO2 assimilation, promoted the distribution of14 CO2 assimilate from leaf to spike and root, accelerated the kernel growth rate. Wheat yield was increased significantly by supplying with K fertilizer in the field experiment, the average 7. 3 kg grain yield could be increased from the application of l kg K2O. |
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| Keywords: | Winter wheat Potassium nutrition Photosynthesis 14C assimilate Senes-cence |
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