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Multivariate analysis of geographically diverse rice germplasm for genetic improvement of yield, dormancy and shattering-related traits

Published online by Cambridge University Press:  07 April 2021

K. Deepika ,
Krishna Lavuri ,
Santosha Rathod ,
Chandra Mohan Yeshala ,
Aravind Kumar Jukanti ,
S. Narender Reddy ,
Subba Rao LV  and
Jyothi Badri Open the ORCID record for Jyothi Badri [Opens in a new window]
K. Deepika
Affiliation:
Department of Genetics and Plant Breeding, College of Agriculture, Professor Jayashankar Telangana State Agricultural University (PJTSAU), Rajendranagar, Hyderabad-500030, India
Krishna Lavuri
Affiliation:
Rice Research Centre (RRC), Agricultural Research Institute (ARI), PJTSAU, Hyderabad, India
Santosha Rathod
Affiliation:
ICAR-Indian Institute of Rice Research (ICAR-IIRR), Rajendranagar, Hyderabad-500030, India
Chandra Mohan Yeshala
Affiliation:
Rice Research Centre (RRC), Agricultural Research Institute (ARI), PJTSAU, Hyderabad, India
Aravind Kumar Jukanti
Affiliation:
ICAR-Indian Institute of Rice Research (ICAR-IIRR), Rajendranagar, Hyderabad-500030, India
S. Narender Reddy
Affiliation:
Department of Plant Physiology, College of Agriculture, PJTSAU, Hyderabad, India
Subba Rao LV
Affiliation:
ICAR-Indian Institute of Rice Research (ICAR-IIRR), Rajendranagar, Hyderabad-500030, India
Jyothi Badri*
Affiliation:
ICAR-Indian Institute of Rice Research (ICAR-IIRR), Rajendranagar, Hyderabad-500030, India
*
*Corresponding author. E-mail: jyothirishik@gmail.com
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Abstract

A diverse set of 107 rice genotypes was evaluated for yield, shattering and dormancy traits. Analysis of variance revealed sizable variation while skewness and kurtosis values indicated near-normal distribution for most of the traits, thus quantitative nature controlled by many genes. A highly significant deviation from a normal distribution for dormancy and shattering % indicated their qualitative nature of inheritance. Four promising genotypes ‘IRGC1723’ (early with 65 days to flowering), ‘IRGC 11108’ and ‘RNR 15459’ (high grain number – 358 and low average shattering – <5%), ‘RNR 11718’ (high single plant yield – 56.73 g, low average shattering – <5% and dormancy period – 21 days) are identified. A significant positive correlation between shattering and dormancy confirms inter-relationship among domestication-related characteristics. The principal component analysis revealed the contribution of four PCs to maximum variability and hierarchical clustering grouped the genotypes into 18 divergent clusters. Five cultivars (Karimnagar Samba, Sheetal, PR 121, Pranahitha and Jagitial Samba) with a combination of low shattering ability (3.35–5.7%) and considerable dormancy period (13–20 days) falling in the same cluster can be used as donors for the improvement of rice genotypes with low shattering ability and incorporating a considerable period of dormancy so as to avoid pre-harvest sprouting due to delayed harvesting. Further, they can be crossed with ‘Pratyumna’ having less than 1 week dormancy period, a genotype of the cluster XVII with which they have a maximum genetic divergence of 51.4 and may serve as parents in the development of mapping populations for the identification of QTLs/genes for shattering and dormancy traits.

Keywords

augmented randomized complete block designdormancymultivariate analysisriceshatteringyield
Type
Research Article
Information
Plant Genetic Resources , Volume 19 , Issue 2 , April 2021 , pp. 144 - 152
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of NIAB

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