Breeding and Seed Production Techniques of New Aromatic Danxiangyouzhenliang Rice Variety with Good Quality and High Yield

Danxiangyouzhenliang rice is a high-quality rice variety derived from the hybrid breeding of Danxiang 12A and Xianghuixiangmiao R133.Its unique temperature-sensitive three-line characteristics endow it with significant advantages of high and stable yield,and its rice fragrance is exquisite and its taste is delicate.Danxiangyouzhenliang rice showed good resistance to rice blast and bacterial blight.On June 10,2021,Danxiangyouzhenliang rice passed the Guangxi Crop Variety Approval(Guishendao 2021074).Danxiangyouzhenliang rice is suitable to be planted as early and late rice in southern,central and northern Guangxi.This study summarized the breeding process and high-yielding seed production techniques of Danxiangyouzhenliang rice,in order to provide useful reference for rice breeders and growers.

山杏良种嫁接愈合过程中生理生化特性研究

为探讨山杏良种芽接成活机理,丰富快繁技术体系提供理论基础,本研究以沈阳农业大学选育的"山杏1号"良种为试验材料,进行不同取芽部位的对比试验以及对芽接愈合过程中生理生化特性的研究,试验采用"T"字形芽接法,以枝条上部、中部及下部共3种不同取芽部位进行对比试验,嫁接高度10cm,芽片长度2cm,每处理嫁接200株,共设3次重复。嫁接第1,3,5,7,9天于13:30分进行采样,测定嫁接体愈合部位POD、CAT、PPO活性变化及可溶性糖、可溶性蛋白、粗淀粉含量,同时进行成活率调查。结果表明:上部取芽嫁接成活率最高,为95.0%;中部次之,为92.7%;下部最低,为92.0%。愈合过程中不同取芽部位的酶活性及营养物质含量变化均呈"先升高后降低"的趋势,且均在5d时达到峰值。在测定的3种活性酶中,POD、CAT活性变化与山杏良种芽接成活率呈正相关,PPO活性变化与成活率呈负相关,CAT的促进作用不如POD明显。在营养物质含量变化中,可溶性糖、可溶性蛋白及粗淀粉含量的变化趋势一致,均与成活率呈正相关。不同取芽部位峰值(5d)时的POD、CAT活性及可溶性糖、可溶性蛋白、粗淀粉含量均表现为上部>中部>下部,PPO表现为下部>中部>上部;在不同愈合阶段中,5d的PPO活性、营养物质含量与其他天数相比差异显著,这说明5d可能是嫁接体愈伤组织形成的关键时期。