Research Papers

Effects of Nitrogen Level and High Temperature at Late Booting Stage on Yield and Physiological Characteristics of Two Early Rice Cultivars

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  • Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China;

Received date: 2014-03-05

  Revised date: 2014-07-19

  Online published: 2014-09-10

Abstract

The compound effects of nitrogen level and high temperature at late booting stage on rice yield were investigated at two nitrogen levels, with hybrid rice combination (Ganxin 203) and  conventional rice cultivar (Zhong 531) as materials at 38 °C for 4 days at late booting stage. We analyzed the difference in grain yield and physiological indicators of the  two rice cultivars and nitrogen effects under high temperature. The results showed that yield per plant, effective panicle number per plant, spikelet number per panicle, spikelets fertility, differentiated spikelet number per panicle, and harvest index of  the two rice cultivars decreased to various degrees under high temperature at the same nitrogen level at late booting stage. Furthermore, high temperature significantly decreased yield per plant, spikelet  fertility, and harvest index   compared with natural temperature (P< 0.05). The ratio of degenerated spikelets, leaf weight per stem, stem and sheath weight per stem increased under high temperature, while under high temperature  the ratio of degenerated spikelets significantly increased  compared with natural temperature (P< 0.05).  At  the same nitrogen level, the chlorophyll contents of the two cultivars increased to various degrees at the late stage under high temperature. For Zhong 531, the chlorophyll contents increased by a  lower increasing percentage at  high nitrogen level compared with that at normal nitrogen level  under  high  temperature. In addition,  yield per plant and effective panicle number per plant of the two cultivars at  high nitrogen level were higher than those at  normal nitrogen level. Under  high temperature, spikelet number  per panicle, 1000grain weight, and harvest index of Zhong 531 at  high nitrogen level were significantly higher than those at normal nitrogen level, while spikelet fertility was significantly reduced. It was worth noting that  yield per plant of the two cultivars at  high nitrogen  level decreased by a lower percentage  compared with normal nitrogen level under high temperature, implying that   appropriate  high nitrogen levels contributed to relief of  the effects of high temperature on grain production.

Cite this article

YANG Jun, CHEN Xiaorong, ZHU Changlan, PENG Xiaosong, HE Xiaopeng, FU Junru, OUYANG Linjuan, BIAN Jianmin, HU Lifang, HE Haohua* . Effects of Nitrogen Level and High Temperature at Late Booting Stage on Yield and Physiological Characteristics of Two Early Rice Cultivars[J]. Chinese Journal OF Rice Science, 2014 , 28(5) : 523 -533 . DOI: 10.3969/j.issn.1001-7216.2014.05.010

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