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Strategic Study of CAE >> 2012, Volume 14, Issue 3

Properties of photosynthesis and spectral reflectance in leaves of maize under the low and variable water conditions

1. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Yangling, Shannxi 712100, China

2. College of Life Sciences, Huaibei Normal University, Huaibei, Anhui 235000, China

 

Funding project:黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(10501-277) Received: 2011-11-17 Available online: 2012-03-13 14:32:30.000

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Abstract

The present study was carried out to examine the effects of low and variable water conditions on plant biomass, root to shoot ratio, chlorophyll fluorescence, gas exchange and spectral features in leaves of maize (Zea mays cv. Suyu 19) by pot experiment. The results showed that continuing drought led to an inhibition of plant growth, increase of root to shoot ratio, and inhibition of photosynthesis through stomatal and/or nonstomatal limitations. The mSR705, chlNDI and REP were also significantly reduced by continuing drought compared to the controls, whereas SIPI was unaffected. Under the low and variable water conditions, plant growth was inhibited, however, the root to shoot ratio, chlorophyll fluorescence, gas exchange and spectral properties were similar to the controls. The results indicated that the maintenance of biomass allocation, photosynthesis and spectral reflectance might be an important mechanism for maize to adapt the low and variable water conditions.

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