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- Title
缺钾对越冬期油菜光合特性和叶绿体超微结构的影响.
- Authors
潘勇辉; 陆志峰; 鲁剑巍; 李凯旭; 李小坤; 丛曰环; 任 涛
- Abstract
To understand leaf photosynthesis characteristics and its response to K starvation in oilseed rape,a field experiment was carried out on K — deficient soil with K deficiency (— K) and K supply (+ K) treatments. Gas exchange,chlorophyll fluorescence and chloroplast ultrastructure were studied using winter oilseed rape cultivar Zheyou 601 during over - wintering period. Results showed that leaf net photosynthetic rate (Pn) decreased by 45. 1% under — K condition. Although stomatal conductance (gs) was lower in — K treatment than in + K treatment, intercellular C02 concentration () increased 66(xmol C02 • mol1. Limiting value of stomata (Ls) decreased by 45.7%. Thus the stomatal factor changes were not the main reason for Pn decrease under - K condition. Further evidences from chlorophyll fluorescence measurement showed that both photosystem Φ (PSII) maximum photochemical quantum yield (Fy/Fm) and PSII actual photochemical quantum yield (3>PSII) were declined under — K treatment, which indicated that PSII reaction center was damaged. In addition, K deficiency affected chloroplast ultrastructure of leaves. In K deficient plants, chloroplast length decreased significantly (with the average of 15. 6%). Chloroplast thickness and distance from chloroplast to cell wall increased by 26. 9% and 56. 1%, respectively. In conclusion, the non - stomatal factors, e. g. damaged PSII reaction center and chloroplast ultrastructure alteration inhibited leaf Pn under K deficiency.
- Publication
Chinese Journal of Oil Crop Sciences, 2015, Vol 37, Issue 5, p688
- ISSN
1007-9084
- Publication type
Academic Journal
- DOI
10.7505/j.issn.1007-9084.2015.05.015