Genetic analysis of introgression lines of Oryza rufipogon for improvement of low phosphorous tolerance in indica rice

IF 1 4区生物学 Q3 PLANT SCIENCES

Indian Journal of Genetics and Plant Breeding Pub Date : 2022-04-25 DOI:10.31742/ijgpb.82.2.1

P. Basavaraj, C. Gireesh, Muralidhara Bharamappanavara, C. Manoj, Lakshmi V. G. Ishwaryalakshmi, P. Senguttuve, R. Sundaram, L. Subbarao, M. Anantha

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引用次数: 2

Abstract

Soil phosphorus (P) deficiency is one of the major challenges for rice cultivation. The present study was carried out under low soil P condition (available P, < 2 kg ha-1) to study the genetic variability, correlation, path and principal component analysis (PCA) in a set of 40 introgression lines derived from Samba Mahsuri (Oryza sativa ssp. indica) × Oryza rufipogon. High genotypic coefficient of variation and phenotypic coefficient of variation was recorded for productive tillers (PT), seed weight (SW), and grain yield (GY). High heritability coupled with high genetic advance was recorded for plant height (PH), PT, SW, number of spikelets/panicle (SPP), spikelet fertility, and GY. Correlation analysis revealed that grain yield had a significant positive association with PH, PT, panicle length, SPP, and SW. Regression analysis revealed that the grain yield was mainly influenced by PT and SW. This was confirmed by path analysis, wherein PT and SW exerted the highest direct positive effect on grain yield. The PCA revealed that the first two PCs contribute to maximum variability, which together accounted for 60% of the total variability. The traits PT and SW contributed the maximum to load/variance the total variability. Thus, the selection of introgression lines with a greater number of PT and higher SW would be the most appropriate strategy for yield improvement under low soil P condition in rice. Cluster analysis grouped introgression lines along with checks into three clusters. Overall, the study revealed the pattern genetic variability for low P tolerance in the introgression lines. This further helps in designing appropriate breeding strategies for the improvement of rice cultivars for low P tolerance.

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提高籼稻耐低磷性的水稻渐渗系遗传分析

土壤磷缺乏是水稻种植面临的主要挑战之一。本研究在低土壤磷（有效磷<2kg ha-1）条件下，对桑巴（Oryza sativa ssp.indica）×水稻（Oryzarufipogon）40个渐渗品系的遗传变异性、相关性、通径和主成分分析（PCA）进行了研究。生产分蘖数（PT）、种子重量（SW）和籽粒产量（GY）的基因型变异系数和表型变异系数较高。株高（PH）、PT、SW、每穗小穗数（SPP）、小穗育性和GY具有较高的遗传力和较高的遗传进展。相关分析表明，籽粒产量与PH、PT、穗长、SPP和SW呈正相关。回归分析表明，小麦产量主要受PT和SW的影响。通径分析证实了这一点，其中PT和SW对粮食产量的直接正向影响最大。主成分分析显示，前两个PC对最大变异性有贡献，它们合计占总变异性的60%。性状PT和SW对负荷/方差（总变异性）的贡献最大。因此，在低土壤磷条件下，选择PT数量较多、SW含量较高的渗入系是提高水稻产量的最合适策略。聚类分析将渐渗线和check分为三个聚类。总体而言，该研究揭示了渗入系中低磷耐受性的模式遗传变异。这进一步有助于设计合适的育种策略，以提高水稻品种对低磷的耐受性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Indian Journal of Genetics and Plant Breeding PLANT SCIENCES-

CiteScore

1.80

自引率

10.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Advance the cause of genetics and plant breeding and to encourage and promote study and research in these disciplines in the service of agriculture; to disseminate the knowledge of genetics and plant breeding; provide facilities for association and conference among students of genetics and plant breeding and for encouragement of close relationship between them and those in the related sciences; advocate policies in the interest of the nation in the field of genetics and plant breeding, and facilitate international cooperation in the field of genetics and plant breeding.