Effects of high temperature at anthesis on spikelet fertility and grain weight in relation to floral positions within a panicle of rice (Oryza sativa L.)
Zhen-Zhen Cao A B , Qian Zhao A , Fu-Deng Huang C , Ke-Su Wei A , Syed-Hassan-Raza Zaidi A , Wei-Jun Zhou A D and Fang-Min Cheng A D E
+ Author Affiliations
- Author Affiliations
A Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
B Rice Product Quality Supervision and Inspection Center, China National Rice Research Institute, Hangzhou 310006, China.
C Institute of Crop and Nuclear Technology Utilisation, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
D Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing, China.
E Corresponding author. Email: chengfm@zju.edu.cn
Crop and Pasture Science 66(9) 922-929 https://doi.org/10.1071/CP14207
Submitted: 25 July 2014 Accepted: 24 April 2015 Published: 4 September 2015
Abstract
Responses in spikelet fertility and grain weight to high temperature (HT) at anthesis and the relation to floral positions within a panicle were investigated using two HT-susceptible cultivars (Xieqingzao and Gang46) and two HT-tolerant cultivars (Qianjiang3 and Haunghuazan) under well-controlled climatic conditions. Results showed that effects of HT at anthesis were more adverse for spikelet fertility than for grain weight. The cultivar-dependent difference in spikelet fertility response to HT was mainly attributed to the extent of decrease in pollen viability for HT exposure. HT at anthesis impelled the flowering date of the florets on the middle and lower parts within a panicle, thereby resulting in shortened duration to floret-opening date and relatively concentrated floret-blossoming date. Change in spikelet fertility induced by HT was more notable than that caused by different grain positions, and the effect of HT on pollen viability was independent of the floret positions on the rachides within a panicle. Positional differences in spikelet fertility and grain weight under the HT regime were closely associated with the duration of HT exposure, in addition to differences in competing ability for supply of assimilates after successful fertilisation.
Additional keywords: floral position, grain weight, high temperature, rice (Oryza sativa L.), spikelet fertility.
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