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EVALUATION OF RICE GENOTYPES UNDER MANAGED WATER STRESS CONDITIONS FOR PHYSIO-MORPHOLOGICAL & QUALITY TRAITS, AND ITS RELATIONSHIP WITH FARMER’S PARTICIPATORY SELECTION

KrishiKosh

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Title EVALUATION OF RICE GENOTYPES UNDER MANAGED WATER STRESS CONDITIONS FOR PHYSIO-MORPHOLOGICAL & QUALITY TRAITS, AND ITS RELATIONSHIP WITH FARMER’S PARTICIPATORY SELECTION
 
Creator Patel, Archana
 
Contributor Verulkar, S.B.
Sarawagi, A.K.
(Smt.) Guhe, Arti
Saxena, Ravi R.
 
Subject RICE, GENOTYPES, WATER, PHYSIO-MORPHOLOGICAL, TRAITS, FARMER’S,
Genetics and Plant Breeding
 
Description Of all the abiotic stress that curtails crop productivity, drought is the most devasting one and the most recalcitrant to the breeder‟s effort. Water stress usually has multiple effects on plant growth and development and ultimately affects yield. Water shortage can develop at any time during crop growth; however drought around flowering stage is a recurrent phenomenon in rainfed region. Water shortage during flowering and grain filling stages reduces yield drastically. Two approaches can be followed to improve drought resistance in rice. One approach is to select directly for yield under drought condition or select indirectly using physiological or morphological characteristics associated with drought resistance or combination of both of these strategies. Limited progress has been made in increasing drought resistance upland rice. Poor identification of target environments and difficulties in determining meaningful selection criteria contributing to improved yield under stress are reasons commonly advanced for this lack of success. One additional reason is that the field trials to evaluate drought resistance are complex and difficult to manage and very few of them are informative. Conventional breeding approaches have resulted in development of number of improved cultivars, which are suited to low-input rainfed ecosystem; however, many released varieties are not adopted by farmers. The primary reason for non-adoption may be because the variety does not meet farmers‟ needs or because farmers lack access to seed or information on new varieties. The present study was undertaken to study specific adaptability of different rice genotypes and to understand the correlation between different physio-morphological and quality traits with yield under different water regimes. In addition to this the study also aimed to involve the farmers in the process of identification of drought tolerance genotypes in rice through Farmer‟s Participatory Selection. The mean performance of genotypes under three sets of conditions indicates substantial reduction in yield and dry matter production under rainfed and terminal stage drought conditions as compare to the irrigated condition. Moderate heritability was observed for grain yield under rainfed condition (61.5%) and relatively higher heritability was observed under irrigated (79.3%) and terminal stage drought condition (77.1%). The correlation studies revealed that the grain yield exhibited significantly positive correlation with biological yield, harvest index and root dry matter production. Highly significant correlation was also observed between hulling, milling and head rice recovery percent, elongation ratio and elongation index and for elongation index with kernel length after cooking and L/B ratio of cooked rice. Under Farmers Participatory Selection, farmers clearly preferred two genotypes R-RF-23 and R-RF-36, which was followed by R-RF-21. Participatory Varietal Selection can
be effectively used to enhance the selection efficiency, particularly for traits of farmers‟ choice and in totality as variety, along with its acceptability. Among the three conditions of evaluation at research farm, irrigated condition matches closely with the mean performance and ranking at farmer‟s field.
 
Date 2016-12-22T12:51:16Z
2016-12-22T12:51:16Z
2008
 
Type Thesis
 
Identifier 128 p.
http://krishikosh.egranth.ac.in/handle/1/92183
 
Language en
 
Format application/pdf
 
Publisher Indira Gandhi Krishi Vishwavidyalaya, Raipur