不同生态条件水稻头季和再生季分蘖的相关性分析

Correlation analysis of rice tillering ability between main and ratoon season under different growing environments

为探明水稻头季和再生季分蘖的相关性,为强再生力水稻新品种的选育和再生力相关遗传分析及生理机制研究提供可用的基因资源,以国际水稻所引进的247份栽培稻早中熟核心种质材料为群体,于2017年分别在湖北省荆州市、海南省陵水黎族自治县和广东省英德市3个生态点下种植,分别调查头季稻和再生稻最大分蘖数及有效分蘖数,分析3个生态点下各材料头季稻与再生稻分蘖表型的相关性、材料的分蘖力和再生特性。结果表明,头季稻和再生稻最大分蘖数及有效分蘖数在湖北、海南和广东生态点下均有显著正相关关系;各生态点下籼稻和粳稻的分蘖力存在显著性差异,分蘖力表现为湖北>海南>广东;湖北和海南生态点下籼稻和粳稻的再生率均值大于130%,同一生态点籼稻和粳稻间再生率无明显差异;广东生态点籼稻和粳稻的再生率均值显著大于湖北和海南生态点。籼稻和粳稻在某一个生态点下有极高或极低再生率的材料,在另外两个生态点下不具有重现性。

In order to ascertain the correlation of rice tillering ability between main and ratoon season, and aim to provide germplasm resourse available not only for breeding, but also researching on related genetic analysis and physiological mechanism of strong regenerative ability rice, a total of 247 rice entities were adopted in this study collected from International Rice Research Institute(IRRI). The experiment was conducted in Jingzhou city of Hubei province, Lingshui Li autonomous county of Hainan provice, Yingde city of Guangdong provice in 2017. Maximum tiller and fertile tiller number per plant were investigaed during main and ratoon season. The correlation between four tillering phenotypes of main and ratoon season,tillering ability and ratoon characteristics under the different growing environments was analyzed. Results indicated that maximum tiller and fertile tiller number both in main and ratoon season demonstrated significant positive correlation under three growing environments. Tillering ability showed significantly different under three growing environments, it was observed as Hubei, Hainan and Guangdong in descending order. Average ratooning rate of both indica and japonica subgroup was more than 130% under Hubei and Hainan growing environment, and there was no significant difference in between, no obvious difference was found at the same growing environment. Ratooning rate of indica and japonica subgroup in Guangdong was significantly higher than that in Hubei and Hainan. Our results indicated that a material with extremely high or low ratooning rate at one growing environment is not reproducible under another growing environment.