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Variability in seed germination and dormancy of Indian weedy rice

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Title Variability in seed germination and dormancy of Indian weedy rice
Not Available
 
Creator Dibakar Ghosh
Subhash Kumar Mishra
Raghwendra Singh
Meenal Rathore, Bhumesh Kumar, R.P. Dubey and P.K. Singh
 
Subject Cultivated rice, Dormancy, Ecological variation, Germination, Morphotypes, Weed ecology, Weedy rice
 
Description Research article
Seed dormancy is an adoptive trait of weedy rice to persist in rice production system. Weedy races and wild relatives of
rice exhibit variation in seed dormancy, which allows weedy rice to escape weed management practices, and increases the
flowering synchronization pattern resulting in gene flow between weedy and cultivated rice. In this study, eighteen weedy
rice morphotypes collected from different rice growing areas in India, along with two rice cultivars, were evaluated for
their germination pattern across time. Weedy rice seed germination was recorded periodically at weekly intervals up to 35
weeks after sowing (WAS) under controlled conditions. Dormancy duration was computed and germination index was
calculated at 27 WAS. Significant variability was observed in germination pattern among the weedy rice morphotypes
studied. The weedy rice morphotypes collected from Uttar Pradesh (T68) attained 50% germination after a maximum
duration of 13.5 WAS, while five morphotypes of weedy rice remained ungerminated at 3 WAS. Seven weedy rice
morphotypes germinated at 3 WAS at which both the rice cultivars (BPT 5204 and Pusa 1101) have germinated (96.7 and
83.3%, respectively). Two weedy rice morphotypes had highest germination percentage (98.3%) at 35 WAS, while least
(21%) was recorded with morphotype collected from Chhattisgarh (T41). This study indicated the existence of high
degree of dormancy in weedy rice morphotypes. The findings of this study might be helpful for agronomists and farmers
to develop and implement effective weedy rice management strategies at different rice production systems in India.
Not Available
 
Date 2024-02-14T14:46:58Z
2024-02-14T14:46:58Z
2022-06-08
 
Type Article
 
Identifier Not Available
Print ISSN: 0253-8040 Online ISSN: 0974-8164
http://krishi.icar.gov.in/jspui/handle/123456789/81357
 
Language English
 
Relation Not Available;
 
Publisher The Indian Society of Weed Science