以牡丹江32为试材，研究密度和插秧株数对水稻群体茎蘖数动态、最大叶面积指数、干物重积累及产量的影响，研究发现，为保证水稻较高群体茎蘖数需提高增加每穴插秧株数至4～6株，较小的每穴占地面积有利于群体茎蘖数的提高，最佳行距...以牡丹江32为试材，研究密度和插秧株数对水稻群体茎蘖数动态、最大叶面积指数、干物重积累及产量的影响，研究发现，为保证水稻较高群体茎蘖数需提高增加每穴插秧株数至4～6株，较小的每穴占地面积有利于群体茎蘖数的提高，最佳行距×株距为36 cm ×12 cm ，这与常规栽培方式一致。增加每穴插秧株数可显著增加最大叶面积指数，这种增加作用主要是通过增加每平方米茎蘖数实现的，而增加每穴占地面积对最大叶面积指数有降低作用。成熟期干物重与每穴插秧株数及每穴面积相关性不显著，通径分析表明，增加每穴插秧株数有增加干物重的趋势，而扩大每穴面积会减小干物重。每平方米茎蘖数、成熟期干物重、最大叶面积指数与产量呈显著或极显著正相关。对于牡丹江32水稻品种，插秧规格40 cm ×10 cm 或30 cm ×12 cm ，每穴插秧4～6株，产量可达到8635．4、8634．0 kg·hm -2，二者差异不大，显著或极显著大于其他处理。展开更多
The yield of rice is mostly affected by three factors,namely,panicle number,grain number and grain weight.Variation in panicle and grain numbers is mainly caused by tiller and panicle branches generated from axillary ...The yield of rice is mostly affected by three factors,namely,panicle number,grain number and grain weight.Variation in panicle and grain numbers is mainly caused by tiller and panicle branches generated from axillary meristems(AMs).MOC1 encodes a putative GRAS family nuclear protein that regulates AM formation.Although several alleles of MOC1 have been identified,its variation in germplasm resources remains unclear.In the present study we characterized a novel mocl allele named gnp6 which has a thymine insertion in the coding sequence of the SAW motif in the GRAS domain.This mutation causes arrested branch formation.The SAW motif is necessary for nuclear localization of GNP6/MOC1 where it functions as a transcription factor or co-regulator.Haplotype analysis showed that the coding region of GNP6/MOC1 was conserved without any non-synonymous mutations in 240 rice accessions.However,variation in the promoter region might affect the expression of it and its downstream genes.Joint haplotype analysis of GNP6/MOC1 and MOC3 showed that haplotype combinations H9,H10 and H11,namely MOC1-Hap1 in combination with MOC3-Hap3,MOC3-Hap4 or MOC3-Hap5 could be bred to promote branch formation.These findings will enrich the genetic resources available for rice breeders.展开更多
文摘以牡丹江32为试材，研究密度和插秧株数对水稻群体茎蘖数动态、最大叶面积指数、干物重积累及产量的影响，研究发现，为保证水稻较高群体茎蘖数需提高增加每穴插秧株数至4～6株，较小的每穴占地面积有利于群体茎蘖数的提高，最佳行距×株距为36 cm ×12 cm ，这与常规栽培方式一致。增加每穴插秧株数可显著增加最大叶面积指数，这种增加作用主要是通过增加每平方米茎蘖数实现的，而增加每穴占地面积对最大叶面积指数有降低作用。成熟期干物重与每穴插秧株数及每穴面积相关性不显著，通径分析表明，增加每穴插秧株数有增加干物重的趋势，而扩大每穴面积会减小干物重。每平方米茎蘖数、成熟期干物重、最大叶面积指数与产量呈显著或极显著正相关。对于牡丹江32水稻品种，插秧规格40 cm ×10 cm 或30 cm ×12 cm ，每穴插秧4～6株，产量可达到8635．4、8634．0 kg·hm -2，二者差异不大，显著或极显著大于其他处理。
基金supported by the National Natural Science Foundation of China(31801324,31171521)the Open Project of Guangxi Key Laboratory of Rice Genetics and Breeding(2018-05-Z06-KF08)China Postdoctoral Science Foundation(2017T100117 and 2019M650902)。
文摘The yield of rice is mostly affected by three factors,namely,panicle number,grain number and grain weight.Variation in panicle and grain numbers is mainly caused by tiller and panicle branches generated from axillary meristems(AMs).MOC1 encodes a putative GRAS family nuclear protein that regulates AM formation.Although several alleles of MOC1 have been identified,its variation in germplasm resources remains unclear.In the present study we characterized a novel mocl allele named gnp6 which has a thymine insertion in the coding sequence of the SAW motif in the GRAS domain.This mutation causes arrested branch formation.The SAW motif is necessary for nuclear localization of GNP6/MOC1 where it functions as a transcription factor or co-regulator.Haplotype analysis showed that the coding region of GNP6/MOC1 was conserved without any non-synonymous mutations in 240 rice accessions.However,variation in the promoter region might affect the expression of it and its downstream genes.Joint haplotype analysis of GNP6/MOC1 and MOC3 showed that haplotype combinations H9,H10 and H11,namely MOC1-Hap1 in combination with MOC3-Hap3,MOC3-Hap4 or MOC3-Hap5 could be bred to promote branch formation.These findings will enrich the genetic resources available for rice breeders.
