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Seedling vigour as a potential indicator for rapid screening of rice (Oryza sativa L.) genotypes for aluminium (Al) toxicity tolerance

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Title Seedling vigour as a potential indicator for rapid screening of rice (Oryza sativa L.) genotypes for aluminium (Al) toxicity tolerance
 
Creator Bhadra, Sanjib
Roy, Bidhan
 
Subject Acid soil
Germination speed
Paddy
Soil acidity
 
Description 493-499
Aluminium (Al) is solubilized into a phytotoxic form [Al(H2O)6
3+] in acid soil, which is known as Al3+. Al toxicity is the
primary growth-limiting factor for plants in acid soils. Breeding of rice for enhanced Al tolerance considered to be an important
approach for increasing grain yield in acid soils. In the present endeavour, we studied the effects of toxic levels of Al on vigour
of rice seedlings under hydroponics and finally grouped the genotypes with varied degree of tolerance to Al toxicity based on
vigour index. Good seed germination (%), high speed of germination and high vigour index indicate uniform crop stand.
Germination ranged from 72-99.50%. It was significantly high for almost all genotypes (80%) except three. The speed of
germination ranged from 9.75 to 29.99 in control. Most of the genotypes showed high speed of germination (15.00) except a
few. Remarkable reduction in seedling vigour has been reported earlier under stressed environments. Low seedling vigour has
been identified as the key factor responsible for poor germination and uneven seedling establishment. Based on the vigour
index, nine genotypes were classified as tolerant, 19 as moderately tolerant and 12 as susceptible. Among the tolerant
genotypes, UBKVR-3 showed maximum value for vigour index followed by UBKVR 19, UBKVR 9, UBKVR 8, Parijat,
MTU 1075 and Radhunipagal. Most susceptible genotypes based on seedling vigour were found to be Pusa Basmati,
Aiswarya and Pratikha. It is to be mentioned that till now there is no clear and distinct divisions of vigour index for
classification into different levels of tolerance towards Al toxicity. In our study, we have identified distinct classes for
grouping of genotypes endowed with different levels of tolerance. The values of the vigour index depend upon root length,
shoot length or some other characters used for calculation of vigour index. The magnitude of the vigour index may not be
useful for classification uniformly across the crops as well as genotypes within the crop. Hence, the procedure used in this
work may overcome the above mentioned constraints.
 
Date 2021-08-05T08:49:35Z
2021-08-05T08:49:35Z
2021-07
 
Type Article
 
Identifier 0975-1009 (Online); 0019-5189 (Print)
http://nopr.niscair.res.in/handle/123456789/57849
 
Publisher NIScPR-CSIR, India
 
Source IJEB Vol.59(07) [July 2021]