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- Title
Effects of reduced solar radiation on winter wheat flag leaf net photosynthetic rate.
- Authors
ZHENG You-fei; NI Yan-li; MAI Bo-ru; WU Rong-jun; FENG Yan; SUN Jian; LI Jian; XU Jing-xin
- Abstract
Taking winter wheat Triticum aestivum L. (cv. Yangmai 13) as test material, a field experiment was conducted in Nanjing City to study the effects of simulated reduced solar radiation on the diurnal variation of winter wheat flag leaf photosynthetic rate and the main affecting factors. Five treatments were installed, i. e. , 15% (T15), 20% (T20), 40% (T40), 60% (T60 ), and 100% (CK) of total incident solar radiation. Reduced solar irradiance increased the chlorophyll and lutein contents significantly, but decreased the net photosynthetic rate (Pn). Under different solar irradi- ance, the diurnal variation of Pn had greater difference, and the daily maximum Pn was in the order of CK>T60 >T40 >T20 >T15. In CK, the Pn exhibited a double peak diurnal curve; while in the other four treatments, the Pn showed a single peak curve, and the peak was lagged behind that of CK. Correlation analysis showed that reduced solar irradiance was the main factor affecting the diurnal variation of Pn, but the physiological parameters also played important roles in determining the diur- nal variation of Pn. In treatments T60 and T40, the photosynthesis active radiation (PAR), leaf tem- perature (Tl), stomatal conductance (Gs), and transpiration rate (Tr) were significantly positively correlated with Pn, suggesting their positive effects on Pn. The intercellular CO2 concentration (Ci) and stomatal limitation (Ls) had significant negative correlations with Pn in treatments T60 and T40 but significant positive correlations with Pn in treatments T20 and T15, implying that the Ci and Ls had negative (or positive) effects on Pn when the solar irradiance was higher (or lower) than 40% of incident solar irradiance.
- Subjects
NANJING (Jiangsu Sheng, China); JIANGSU Sheng (China); CHINA; WINTER wheat; EXPERIMENTAL agriculture; EFFECT of solar radiation on plants; SPECTRAL irradiance; CHLOROPHYLL synthesis
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2011, Vol 22, Issue 6, p1457
- ISSN
1001-9332
- Publication type
Article