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Effect of Low Phosphorus Stress on Photosynthetic Characteristics of Different Wheat Genotypes

Author: DongFei
Tutor: YangXingHong
School: Shandong Agricultural University
Course: Botany
Keywords: Wheat Low Phosphorus Stress Thylakoid membrane Photosynthetic characteristics
CLC: S512.1
Type: Master's thesis
Year: 2009
Downloads: 90
Quote: 1
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Abstract


Soil Phosphorus deficiency is one of the major factors restricting the growth of wheat. Screening and nurturing tolerance to low phosphorus genotype wheat is one of the effective ways to alleviate the lack of phosphate rock resources and improve fertilizer use efficiency. Wheat adapt the the nutrition physiological mechanism of low phosphorus stress screening development work it has very important significance. Wheat photosynthetic characteristics under low phosphorus stress in this study different patience genotype wheat varieties Xiaoyan 54 (the efficient phosphorus) and Jing 411 (phosphorus inefficient) materials, low phosphorus stress, thylakoid membrane lipid composition of PSII photochemical activity and antioxidant enzyme activity, the main results are as follows: (1) low phosphorus stress reducing wheat biomass, inhibit the growth of wheat plants, to make it shorter root length, lateral root number increased. Under low phosphorus stress, Beijing 411 biomass and root length decreased more Xiaoyan 54 did not change significantly. This may be related to the higher Xiaoyan 54 P uptake efficiency. (2) the impact of phosphorus stress on photosynthesis characteristics of wheat varieties with different phosphorus efficiency. Compared with Jing 411, Xiaoyan 54 growth by low phosphorus stress. Phosphorus Stress Jing 411 and Xiaoyan 54 leaf photosynthetic rate decreased by 63.73% and 59.6%, respectively. Low Phosphorus Stress significantly lower leaves of two wheat varieties stomatal conductance, intercellular CO2 concentration. Two wheat varieties in low phosphate endurance differences may be related to their differences in photosynthetic characteristics. (3) low phosphorus stress reduced PG content in wheat leaves. PG content in leaves under low phosphorus stress Xiaoyan 54 Beijing 411, a decrease of less than conducive to ease the PG-specific binding photosystem II light-harvesting pigment complex degradation. SQDG content in wheat leaves under low phosphorus stress increased to make up for the decline in PG content the thylakoid membrane anionic lipid content was maintained at normal levels, so as to ensure the normal photosynthesis. (4) low phosphorus stress rising wheat leaf initial fluorescence yield (Fo), maximal photochemical efficiency of PSII (Fv / Fm) decreased, resulting in the potential vitality of photosynthesis decline. Under low phosphorus stress, Xiaoyan 54 to maintain a relatively high PSII photochemical activity, the strong performance of low phosphate endurance. (5) Phosphorus Stress led to increase in the oxygen content of wheat leaves under four main antioxidant enzymes (SOD, APX, POD, CAT) activity increased. 54 Xiaoyan wheat leaves under low phosphorus stress increased antioxidant enzyme activity than Jing 411, for protection thylakoid membrane composition and function, an important role in maintaining photosynthesis in the face of adversity.

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CLC: > Agricultural Sciences > Crop > Cereal crops > Wheat > Wheat
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