Fig. 2.

Phenotypic variation for milling quality traits in the diversity panel of 320 indica lines and their correlations with grain chalkiness. (a) Diversity for milling potential showing a large degree of variation for HRY (y-axis). The labels at the top indicate the stages during the milling process. Milling fractions include the hull (outer seed coat), the removal of which during the dehulling process give rise to brown rice. Removal of bran fraction results in milled rice (broken + intact grains). The intact grains represent the % HRY. (b, c) Correlations among different milling quality traits, grain chalkiness, and grain dimension attributes in (b) control and (c) moisture stress conditions. Blue and red indicate positive and negative correlations, respectively, and the size of the circles and intensity of the colour represent the degree of correlation. PGC, % grain chalkiness; GL, grain length; GW, grain weight; PBR, % brown rice; WBR, weight brown rice; HRY, head rice yield (%); WHR, weight head rice; PMR, % milled rice; WMR, weight milled rice. In both control and stress conditions, PGC showed negative correlations with the all of milling quality traits including the HRY and WHR, whereas showed positive correlation with GW.