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Analysis of Genes for Stigma Coloration in Rice - IRRI books

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All the F 3 populations <strong>of</strong> 70–80 l<strong>in</strong>es <strong>in</strong> each cross showed a ratio <strong>of</strong> 1 homozygous<br />

unrolled: 2 segregat<strong>in</strong>g: 1 homozygous rolled, with a probability level <strong>of</strong> 0.34–0.99<br />

(Table 2). When the percentage <strong>of</strong> rolled plants per family was considered, a discrete<br />

distribution was apparent <strong>in</strong> almost all crosses (Fig. 1).<br />

Dur<strong>in</strong>g 1990 DS, to lessen the effect <strong>of</strong> soil moisture variability, the F 2 rows were<br />

randomized and the roll<strong>in</strong>g scores were taken at 1600–1750 h, when the difference <strong>in</strong><br />

rolled and unrolled leaves was clearly visible. By this time the leaves <strong>of</strong> some <strong>of</strong> the<br />

1. Distribution <strong>of</strong> plants <strong>of</strong> F 3 l<strong>in</strong>es with rolled leaves under drought stress <strong>for</strong> crosses between 5 resistant<br />

(IR33353, IR26702, ITA186, Salumpikit, MGL2) and 2 susceptible (IR29692, IR29725) rices. <strong>IRRI</strong>, 1989<br />

dry season.<br />

Genetics <strong>of</strong> leaf roll<strong>in</strong>g under drought stress 163

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