[Dynamics of water retaining capacity and chlorophyll content of two-line hybrid rice during heading-grain filling stage and their relations with grain yield].
The study with 25 two-line hybrid rice strains showed that their water retaining capacity was different with their combinations. On the whole, the water content in leaf and stem-sheath decreased during heading-grain filling stage, while that in panicle increased first and then decreased, with a peak at 7th day after heading. Stem-sheath was the main organ for water retaining. The correlation of panicle yield with both leaf and stem-sheath water content was positive at the 1st day after heading but became negative later, and that with whole stem-plant water content was positive after heading. The chlorophyll content of the two-line hybrids increased first and then decreased, with a peak at the 7th day after heading. Comparing with normal rice (male parent), the chlorophyll content of most two-line hybrids was lower, and the decreasing rate was faster than that of normal rice after heading. For two-line hybrid rice breeding, it should preferentially consider to select those hybrids which have a clearer dominance of plant water retaining capacity and a higher chlorophyll content at earlier and middle heading-grain filling stage, and an obvious dry matter transportation from leaf and stem-sheath at later heading-grain filling stage. For two-line hybrid rice planting, it should not only pay attention to the supply of water and nutrients, especially nitrogen at earlier and middle heading-grain filling stage, but also control nitrogen and water in time to prevent leaf green clinging and to promote dry matter transportation from leaf and stem-sheath to grain at later heading-grain filling stage.
Chen
Xiaorong
X
Province Key Laboratory of Crop Physiology, Ecology, Genetic and Breeding, Jiangxi Agricultural University, Nanchang 330045, China. ccxxrr80@163.com
Zhong
Lei
L
Zuo
Qingfan
Q
D018533:Biomass; D002678:Chimera; D002734:Chlorophyll / Q000378:metabolism*; D002523:Edible Grain / Q000254:growth & development*; D012275:Oryza / Q000254:growth & development*; D014867:Water / Q000378:metabolism*
D014867:Water; D002734:Chlorophyll