作物学报2024，Vol.50Issue(8)：1907-1919,13.DOI:10.3724/SP.J.1006.2024.42002
水稻黄华占背景选择导入系的耐低氮筛选评价与利用
Screening,evaluation,and utilization of low nitrogen tolerance for the selected introgression lines in rice with Huanghuazhan background
摘要
Abstract
Nitrogen deficiency in medium-yield and low-yield fields is an important factor restricting the high yield in rice.It is one of effective ways to solve the problem by screening and developing rice variety with low nitrogen tolerance(LNT).In this study,the selected introgression lines(SILs)from germplasms in Huanghuazhan(HHZ)background were used to evaluate the performance of yield and its related traits under low and normal nitrogen conditions for successive three seasons.Low nitrogen had least effect on heading date,seed fertility,and 1000-grain weight(TGW)with the average low nitrogen tolerance index(LNTI)around 1.0,whereas had greatest effect on grain yield per plant(GYP)and panicle number per plant(PN)with the respective average LNTI of 0.45 and 0.62,indicating that GYP and PN were useful indicator of LNT.Based on LNTI of GYP,nine LNT lines were selected with LNTI ranging from 0.87 to 1.04.Five of the selected LNT lines verified by multiple-site trials,one line(M281)had low LNT with GYP-LNTI of 0.66 and the other four had high LNT with the average GYP-LNTI of 0.94,indicating that LNT was a characteristic with the differences at individual and population levels,thus emphasizing the importance of popula-tion verification for LNT materials which were screened from segregation population.Among the four LNT lines,M85 was mainly achieved by higher PN and TGW under low nitrogen condition,whereas the other three lines(M382,M563,and M79)were mainly supported by more filled grains per panicle(FGP)and higher TGW.Therefore,an important way was proposed to achieve high yield under low nitrogen condition through increasing FGP based on a relatively high PN.In view of salt tolerance at seedling stage,drought tolerance at reproductive stage and LNT at all growth duration of SILs,it was discussed how to simulta-neously improve multiple complex abiotic stress tolerances using SILs derived from diverse donors by molecular design.关键词
水稻/选择导入系/耐低氮/耐低氮指数/抗逆性改良Key words
rice/selected introgression line/low nitrogen tolerance/low nitrogen tolerance index/stress tolerance improvement引用本文复制引用
邵美红,赵玲玲,程楚,程思明,朱双兵,翟来圆,陈凯,徐建龙..水稻黄华占背景选择导入系的耐低氮筛选评价与利用[J].作物学报,2024,50(8):1907-1919,13.基金项目
本研究由国家重点研发计划项目(2023YFF1000400)资助.This study was supported by the National Key Research and Development Program of China(2023YFF1000400). （2023YFF1000400）
