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Effect of salinity and use of stress indices of morphological and physiological traits at the seedling stage in rice

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Title Effect of salinity and use of stress indices of morphological and physiological traits at the seedling stage in rice
 
Creator S L Krishnamurthy
P C Sharma
S. K. Sharma
V Batra
V Kumar
LVS Rao
 
Subject salinity rice seedling
 
Description Not Available
Rice (Oryza sativa L.) is the most important cereal crop and a major staple food for majority of the human populations
worldwide. Rice crop is sensitive to salinity. In spite of large number of studies on salinity tolerance of rice, our knowledge on
the overall effect of salinity on rice seedling growth is limited. Improvement in salt tolerance of crop plants remains
indescribable, largely due to the fact that salinity is a complex trait which affects almost every aspect of the physiology,
biochemistry and genomics of plants. The present investigation was conducted to establish the relationship between various
morphological, physiological traits and stress indices. A set of 131 rice accessions was evaluated in two levels namely, non-
stress (EC ~ 1.2 dS/m) and saline stress (EC ~ 10 dS/m) in hydroponics at seedling stage. Root length and shoot lengths were
reduced by 52 and 50%, respectively in saline stress compared to non-stress conditions. There was a significant correlation
between various morphological and physiological parameters in non-saline in addition to saline stress as well as non-stress. The
effect of the increased Na concentration in the medium is detrimental to root length and shoot length as observed by reduction
in root length and a concomitant reduction in shoot length. Increased concentration of Na led to augmented Na /K ratio with
increased stress in the medium and decreased expression of traits. A significant positive correlation (r=0.60) was noticed
between stress tolerance index (STI) of root and shoot length. The stress susceptibility index (SSI) for root length was expressed
significant positive correlation with SSI for shoot length (r=0.43). SSI for K content was registered significant negative
correlation with STI for Na content (r=-0.43). The three accessions namely, IC 545004, IC 545486 and IC 545215 were found
to be the best performers adjudged on the morphological and physiological criteria in saline stress situation. These three rice
accessions could be used as a donor parent or for genotypic studies in future breeding programs.
Not Available
 
Date 2018-09-11T04:44:39Z
2018-09-11T04:44:39Z
2016
 
Type Research Paper
 
Identifier Krishnamurthy S L, P C Sharma, S K Sharma, V Batra V Kumar and L V S Rao. 2016. Effect of salinity and use of stress indices of morphological and physiological traits at the seedling stage in rice. Indian Journal of Experimental Biology. 54 (12) 843-850.
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/6672
 
Language English
 
Relation Not Available;
 
Publisher Not Available