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Agronomy Journal Abstract -

Value of Rice Characteristics in Selection for Resistance to Salinity in an Arid Environment1


This article in AJ

  1. Vol. 76 No. 3, p. 366-370
    Received: May 2, 1983

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  1. W. F. Lehman,
  2. J. N. Rutger,
  3. F. E. Robinson and
  4. M. Kaddah2



The reaction of rice (Oryza sativa L.) plants to soil salinity was studied to identify characteristics of possible value in selection and to develop rapid, reliable selection procedures for use in the development of salinity-resistant rice cultivars. Fourteen characteristics were measured on six cultivars growing in the greenhouse on a mixed hyperthermic Typic Torripsamment-Rositas very fine sand treated with three levels of salinity for 2 years. Year, cultivar, salinity, and the year ✕ cultivar interaction had highly significant effects on most characters. The significant differences for cultivars ✕ years indicate that observations should be made for 2 or more years. Few characteristics showed significant interactions for the year ✕ salinity and cultivar ✕ salinity interactions. Important exceptions were the reproductive characteristics of percent underdeveloped spikelets and chaff weight (an estimate of blanking). From this it appeared selections could be made to reduce the percentage of underdeveloped spikelets and chaff weight. Characteristics with the highest correlation with seed weight were tillers at seedling stage and panicle length. Straw weight and weight of chaff plus straw had significantly positive correlations with the other vegetative characters, plant height and days to maturity, but significantly negative correlations with the reproductive characters of panicle and seed number and weight. Significant correlations and interactions indicate selections should be made for young plants with many tillers and against vigorous adult plants failing to develop reproductively.

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