LU Chuan-gen 1ZOU Jiang-shi1
作者信息
- 1. Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P. R. China
- 折叠
摘要
Abstract
The characteristics of plant type and physiological indices for photosynthesis were analyzedusing two super hybrid rices, Liangyoupeijiu and LiangyouE32 as materials, and an indica hybrid, Shan-you63 as a control. Based on the present analysis and various theories and breeding practices on rice planttype, a model of plant ideotype for super hybrid rice (indica) in the lower reaches of Yangtze River Valleywas proposed. This was: a length of 35 - 40 cm for top leaf with a width of 2 cm, and that of 50 - 55 cmand 55 - 60 crm, respectively, for the second and third leaves from top, meanwhile, having a leaf angle of5°, 10° and 15° respectively, and a curvature of 1 - 1.5 cm-1 for the leaf face at heading stage; the upper-most three leaves keeping their activities for as long as 70 d, which could lead a LAI of 3 at full ripeness;loose plant type with thin (SLW=2.5- 3 gcm-2 , dry weight) and curve-slant leaves during early growingstage, and compact plant type by thick (SLW = 4 - 5 gcm-2 ) and erect leaves during the middle and lategrowing stages; with a coefficient of light extinction of 0.3 - 0.4, which allowed for an optimal LAI high of8 - 10 during the middle growth period; plant height of 110 -120 cm, with 2 -4 cm basal internode and along uppermost internode occupying 45 % of total stem length; 25 - 28 cm panicle with 8 - 10 spikelets percentimeter showing bend-type in ripening; a rich chlorophyll which led to a high net photosynthetic rate,and tolerance to light shading and photooxidation which is of benefit to increasing the adaptability to varyinglight conditions.关键词
Super hybrid rice/Plant type/Physiology/EcologyKey words
Super hybrid rice/Plant type/Physiology/Ecology分类
农业科技
