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| 1 | 水稻不同胞质不育系异交能力对氮肥调控的响应研究显示文摘不育系异交习性的差异影响杂交水稻制种产量,制种过程已成为制约三系杂交水稻推广的关键环节。不育系的异交习性受遗传和环境因素的多重影响。【目的】研究5种水稻不育胞质类型和肥料调控技术对杂交水稻不育系异交习性的影响,为提高繁殖、制种产量提供新的途径。【方法】选择野败型(W)、爪哇型(JW)、冈型(G)、K型(K)和印水型(YS)核质互作不育胞质构建同核异质不育系,研究不同氮肥调控处理不育系的异交习性和繁殖产量,探索胞质效应对不育系异交能力的影响效应及其肥料调控机制。【结果】各同核异质不育系繁殖产量的提高主要由有效穗数、千粒重和结实率的增加共同控制;JW型和W型胞质不育系在10 kg/667m^(2)氮肥施用条件下繁殖产量达到最高,分别达到259.20、244.04kg/667m^(2),GA、KA和YSA则需要18 kg/667m^(2)氮肥施用量其繁殖产量才可以达到250 kg/667m^(2),但又会存在病虫害高发的风险。【结论】胞质效应及其与氮肥的互作对不育系的主要农艺性状和异交习性均会产生显著影响,氮肥水平对不育系的农艺性状和繁殖产量的影响大于胞质效应,胞质效应主要影响不育系的柱头外露等异交习性。 | 钟颖 刘蓉 黄苗 宋翔 朱美霖 李纯华 胡运高 | 2021 | 广东农业科学2021，48，5： | 2 |
| 2 | Fine Mapping of QTLs for Stigma Exsertion Rate from Oryza glaberrima by Chromosome Segment Substitution显示文摘Stigma exsertion is an important trait for outcrossing ability in rice.Stigma exsertion rate(SER)of male sterile lines(MSLs)is a key factor affecting F1-seed production in hybrid rice.In this study,seven QTLs for SER were detected on five chromosomes using a set of single-segment substitution lines(SSSLs)derived from O.glaberrima.Three of the QTLs were mapped in the estimated intervals of 92.5–333.0 kb.qSER-5 was located in a substitution segment of 92.5 kb.qS ER-1 b and qS ER-8 b were respectively limited to 333.0 kb and 107.5 kb by secondary substitution mapping.qSER-1 b and qSER-3 had bigger additive effects of 11.5%and 11.9%,respectively,while the other five QTLs had smaller additive effects from 5.7%to 8.6%.Open reading frames were identified in the regions of qS ER-5 and qSER-8 b in O.sativa and O.glaberrima genomes.Fine mapping of the QTLs laid a foundation for the cloning of genes,and QTLs for SER will be used to develop MSLs with strong ability of outcrossing. | TAN Quanya ZHU Haitao LIU Hui NI Yuerong WU Shengze LUAN Xin LIU Junwei YANG Weifeng YANG Zifeng ZENG Ruizhen LIU Guifu WANG Shaokui ZHANG Guiquan | 2022 | Rice science2022，29，1： | 1 |
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