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A Novel Stay-Green Mutant of Rice with Delayed Leaf Senescence and Better Harvest Index Confers Drought Tolerance

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Title A Novel Stay-Green Mutant of Rice with Delayed Leaf Senescence and Better Harvest Index Confers Drought Tolerance
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Creator Ramkumar MK, Senthikumar S, Kishor Gaikwad, Rakesh Pandey, Viswanathan C, Singh AK, Singh NK, T. Mohapatra and Amitha Mithra SevanthiNot Available
 
Subject drought tolerance; EMS induced mutants; Nagina 22; rice; stay-green trait
 
Description Three Ethyl methansulphonate (EMS)-induced stay-green mutants (SGM-1, SGM-2 and SGM-3) and their wild-type (WT), were tested for their Stay-Green (SG) and drought tolerance nature as the relation between these two attributes is not yet established in rice. In the dark induced senescence assay, SGM-3 showed delayed senescence while SGM-1 and SGM-2 showed complete lack of senescence. Mutants showed stable transcript abundance over time, for 15 candidate genes (CGs) associated with senescence, compared to the WT. SGM-3 however showed moderately increasing transcript abundance over time for ATG6a, ATG4a, NYC1, NOL and NYC3. Only SGM-3 performed better than the WT for yield and harvest index under well irrigated as well as drought conditions, though all the mutants showed better performance for other agronomic traits under both the conditions and ascorbate peroxidase activity under drought. Thus, SG trait showed positive correlation with drought tolerance though only SGM-3 could convert this into higher harvest index. Sequence analysis of 80 senescence-associated genes including the 15 CGs showed non-synonymous mutations in four and six genes in SGM-1 and SGM-2 respectively, while no SNPs were found in SGM-3. Analysis of the earlier reported Quantitative Trait Loci (QTL) regions in SGM-3 revealed negligible variations from WT, suggesting it to be a novel SG mutant.
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Date 2021-07-08T08:54:47Z
2021-07-08T08:54:47Z
2019-09-26
 
Type Research Paper
 
Identifier Ramkumar MK, Senthil Kumar S, Gaikwad K, Pandey R, Chinnusamy V, Singh NK, Singh AK, Mohapatra T, Sevanthi AM*. A Novel Stay-Green Mutant of Rice with Delayed Leaf Senescence and Better Harvest Index Confers Drought Tolerance. Plants. 2019; 8(10):375. https://doi.org/10.3390/plants8100375lable
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http://krishi.icar.gov.in/jspui/handle/123456789/47563
 
Language English
 
Relation Not Available;
 
Publisher MDPI