%0 Journal Article
%T Effect of light intensity on grain quality of rice at different spike positions during grain-filling stage<br>灌浆期不同光强对水稻不同粒位籽粒品质的影响
%A DONG Ming-Hui
%A HUI Feng
%A GU Jun-Rong
%A CHEN Pei-Feng
%A YANG Dai-Feng
%A QIAO Zhong-Ying
%A <br>董明辉
%A 惠 锋
%A 顾俊荣
%A 陈培峰
%A 杨代凤
%A 乔中英
%J 中国生态农业学报
%D 2013
%I 
%X Light intensity is an important ecological factor that greatly influences rice grain formation and quality. This study discussed the effects of light intensity on rice quality at grain-filling stage and the differences in variety types and spikelets at different panicle positions. To do this, two pot-grown super rice cultivars, "Yangliangyou 6" (indica) and "Wuyunjing 23" (japonica), were subjected to three light intensity treatments (71%, 55% and 40% of normal light intensity respectively) at post-anthesis grain-filling stage, with normal outdoor growth as the control. The study aimed to throw more light on the physiological mechanisms of rice grain formation to lay the theoretical basis for improved rice quality. The results suggested that light intensity during grain-filling greatly influenced rice quality. Compared with the control, rice grain quality under the three treatments worsened with the weakening of light intensity. Grain quality response to light intensity varied with light intensity degrees, variety genotypes and grain positions on rice panicles. While grain quality on spikelets with late flower formation was poorly stability, that on spikelets with early flower formation was relatively stable. Milled rice and rice amylose content decreased and chalkiness increased with the weakening of light intensity. Amplitude change in grains on primary tillers was relatively larger than in grain on secondary tillers. Also the weaker the light intensity, the lower was the breakdown value, the higher were the setback value and crud protein content, and the worse were the rice cooking and eating qualities. Reasonable sowing times based on variety type and scientific cultivation practices for improved light conditions and rice growth likely mitigated any negative impacts of low light intensity on rice quality.
%K Grain-filling stage
%K Light intensity
%K Grain position on panicle
%K Variety genotype
%K Rice quality<br>灌浆期
%K 光强
%K 粒位
%K 品种类型
%K 稻米品质
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=D019861B8EEAF330BBB463D0278EDF78&yid=FF7AA908D58E97FA&vid=659D3B06EBF534A7&iid=0B39A22176CE99FB&sid=F260CE035846B3B8&eid=C5F8B8CB20F1B3D8&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=0&reference_num=0