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Characteristics of Photosynthesis and Changes of Physiology and Biochemistry During Seed Development of Cucumber

Author: ZhangZiKun
Tutor: CaoChenXing
School: Shandong Agricultural University
Course: Olericulture
Keywords: Cucumber Seed strains Photosynthetic characteristics 1.5 - ribulose bisphosphate carboxylase Seed development Diurnal variation
CLC: S642.2
Type: Master's thesis
Year: 2005
Downloads: 120
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Abstract


Experimental study of the process of cucumber seed leaf photosynthetic characteristics, photochemical efficiency and 1,5 - ribulose bisphosphate carboxylase activity changes , a single leaf senescence late seed development related physiological and biochemical changes , and photosynthetic late seed development changes in electron transport pathway , chlorophyll degradation and inactivation of photosystem II centers positive significance discussed. The main results are as follows : 1. Cucumber seed strains during seed development before functional changes in leaf photosynthetic rate bimodal curve , photosynthetic rate peak appeared at 10:00 and 14:00 ; cucumber seed development in the late functional photosynthetic rate Pn not declined at noon , but with the light intensity increases , the afternoon with decreasing light intensity decreased photosynthetic rate variation of single- peaked curve , photosynthetic rate highest value at 12:00 . 2 seed later stages , with the cucumber seed strains leaf senescence , leaf captures light energy for photosynthetic carbon assimilation ratio of less and less energy , while being heat dissipation and other means of electronic consumption gradually increased , AQY with the severity of aging decreased . Fv / Fm and ΦPSII in the day with light intensity decreased with increasing the minimum value reached at noon , in the afternoon light intensity weakened, fully restored. In the leaves during senescence , ΦPSII decreased, while Fv / Fm remained stable. With the growth period of the conduct , qP decreased, while qN gradually increased . Early PSII electron transport activity maximum , while the form of heat energy dissipated in a very small proportion . 3 decreased chlorophyll content and photosynthetic rate decreased inconsistent. Photosynthetic rate decreased immediately after reaching a peak , and peak chlorophyll will continue for some time to begin to decline , indicating that the seed development process, not the photosynthetic rate decreased chlorophyll reasons for the decline , but together with other components of the photosynthetic mechanism accompanied by the degradation process . Chlorophyll degradation and inactivation of PSII reaction center is an adaptive mechanism .

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CLC: > Agricultural Sciences > Gardening > Vegetable gardening > Melons > Cucumber
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