Genetic variability, heritability and interrelationship in salt-tolerant lines of T. Aman rice

4区农林科学 Q3 Agricultural and Biological Sciences

Genetika-Belgrade Pub Date : 2022-01-01 DOI:10.2298/gensr2202761k

Ummy Kulsum, Umakanta Sarker, M. Rasul

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引用次数: 13

Abstract

Twenty salt-tolerant breeding lines of T. Aman rice were studied under field conditions at the experimental farm of the Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh. The experiment was conducted following Randomized Complete Block Design (RCBD) with three replications to estimate the genetic variations in yield and yield-related traits, and their interrelationship and to assess the direct and indirect effects of different yield-related traits on grain yield for the selection of high-yielding T. Aman rice. Twelve characters viz., days to flowering, days to maturity, plant height (cm), tillers per hill, panicles per hill, flag leaf length (cm), panicle length (cm), panicle weight (g), filled grains per panicle, spikelet fertility percentage, 100-grain weight (g) and grain yield per m2 (kg) were studied. The genotypes differed significantly for all the traits studied indicating the wide range of variations existed across the genotypes. The analysis of variance of all characters studied was highly significant that revealed a wide range of variability among the newly developed 20 salt-tolerant genotypes of T. Aman rice. The genotypes BU1, BU4, BU6, BU7, and BU14 had high grain yields and could be directly selected as high-yielding varieties. Based on all genetic parameters, all the traits could significantly improve the grain yield of salt-tolerant lines of T. Aman rice. The correlation coefficient revealed that the genotype selected based on days to flowering, days to maturity, plant height (cm), panicles per hill, flag leaf length (cm), panicle weight (g), filled grains per panicle, and spikelet fertility (%) and 100-grain weight directly would significantly contribute to grain yield of 20 salt-tolerant genotypes of T. Aman rice. However, considering the genotypic correlations and path coefficients, direct selection on the basis of panicles per hill, panicle weight, plant height, flag leaf length, filled grains per panicle, spikelet fertility (%), days to flowering, and days to maturity would significantly improve the grain yield of salt-tolerant T. Aman rice genotypes.

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稻耐盐系的遗传变异、遗传力及相互关系

在孟加拉国Bangabandhu Sheikh Mujibur Rahman农业大学遗传与植物育种系实验农场，对20个T. Aman水稻耐盐选育品系进行了田间研究。本试验采用随机完全区组设计(RCBD)进行3个重复，研究高产稻产量和产量相关性状的遗传变异及其相互关系，评价不同产量相关性状对籽粒产量的直接和间接影响。研究了12个性状，即开花天数、成熟天数、株高(cm)、每山分蘖数、每山穗数、旗叶长(cm)、穗长(cm)、穗重(g)、每穗实粒数、小穗育性率、百粒重(g)和每m2产量(kg)。所有性状的基因型差异显著，表明基因型之间存在广泛的差异。所有性状的方差分析均极显著，表明新获得的20个耐盐水稻基因型之间存在较大的变异。BU1、BU4、BU6、BU7和BU14基因型产量较高，可直接选育为高产品种。综合所有遗传参数，所有性状均能显著提高稻耐盐品系的产量。相关系数表明，以开花日数、成熟日数、株高(cm)、每山穗数、旗叶长(cm)、穗重(g)、每穗饱满粒数、小穗育性(%)和百粒重直接选择的基因型对20个耐盐水稻的产量有显著影响。然而，考虑到基因型相关性和通径系数，根据每山穗数、穗重、株高、旗叶长、每穗实粒数、小穗育性(%)、开花期和成熟期直接选择可显著提高耐盐稻基因型的产量。

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来源期刊

Genetika-Belgrade AGRONOMY-GENETICS & HEREDITY

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The GENETIKA is dedicated to genetic studies of all organisms including genetics of microorganisms, plant genetics, animal genetics, human genetics, molecular genetics, genomics, functional genomics, plant and animal breeding, population and evolutionary genetics, mutagenesis and genotoxicology and biotechnology.