ASSOCIATION STUDIES AMONG GRAIN PROPERTIES AND GLYCEMIC INDEX IN RICE (Oryza sativa L.)
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Date
2017
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Acharya N.G. Ranga Agricultural University
Abstract
The present investigation is carried out during kharif 2016 at Andra Pradesh
Rice Research Institute and Regional Agriculture Research Station, Maruteru in order
to evaluate 36 rice genotypes for yield, quality, texture properties and glycemic index
and to study associations among these parameters and to know magnitude of direct and
indirect effects of above parameters on G.I. Data were recorded on days to 50%
flowering, plant height (cm), number of panicles per plant, panicle length (cm), grain
yield per plant (g), test weight (g), kernel length (mm), kernel breadth (mm), L/B ratio,
volume expansion ratio, elongation ratio, alkali spreading value, gel consistency (mm),
amylose content (%), hardness, resilience and glycemic index.
The analysis of variance revealed highly significant differences among the
genotypes for all the characters indicating the presence of sufficient genetic variability
in the studied material.
Estimation of glycemic index showed that there is a lot of variation for the traits
among the genotypes studied that ranged from 49.16 to 84.64 with a mean value of
61.36. Among the genotypes MTU-2716 exhibited lowest GI value of 49.16 and MTU1001
exhibited highest GI value of 74.16. There were 8 genotypes which comes under
low GI category namely MTU-2716 (49.16), MTU-1061 (49.3), MTU-1140 (49.36),
MTU-2077 (49.8), MTU-1184 (50.95), BPT-2270 (51.14), MTU-1075 (54.5) and
BPT-5204 (54.79).
Study of correlation between grain properties and glycemic index revealed that
the glycemic index had significant positive association with the traits viz., grain yield
(0.410**, 0.253*), alkali spreading value (0.526**, 0.535**) and gel consistency
(0.312**, 0.283**) at both genotypic and phenotypic levels. Further, glycemic index
exhibited significant negative correlation with amylose content (-0.346**,-0269*) at
both genotypic and phenotypic levels.
Path analysis studies revealed that GI had shown positive correlation and direct
effect for the characters viz., L/B ratio (0.2281, 0.0145), volume expansion ratio
(0.1367, 0.571), alkali spreading value (0.5259, 0.571) and gel consistency (0.3119,
0.3548); similarly negative correlation along with positive direct effects was observed
in the characters, namely panicle length (-0.0129, 0.2723), test weight (-0.0609,
0.6307) and hardness (-0.0187, 0.64871). Positive association with negative direct
effects as been observed for the characters kernel length (0.0458, -0.2486), plant height
(0.0011, -0.7430), grain yield per plant (0.4253,-0.513), where as negative association
with negative direct effect was also observed for the characters no of productive tillers
per plant (-0.2567, -0.7430), kernel breadth (-0.2025, -0.5879), elongation ratio
(-0.1198, -0.6199), amylose content (-0.03457, -0.3083) and resilience (-0.2253,
-0.6520).
In the present investigation high residual effect (0.699 and 0.689) at both
genotypic level and for phenotypic level, indicated that some other factors which have
not been considered in the present study need to be included in the analysis to account
fully for the variation.
The genotypes such as MTU-2716 (49.16), MTU-1061 (49.3), MTU-1140
(49.36), MTU-2077 (49.8), MTU-1184 (50.95), BPT-2270 (51.14), MTU-1075 (54.5)
and BPT-5204 (54.79) recorded lower G.I. value. Among these varieties MTU-2716,
MTU-1140, MTU-2077, BPT-2270 and BPT-5204 had recorded intermediate desirable
values for alkali spreading value, gel consistency and amylose content, and hence
posses good quality along with the low glycemic index which are recommended for
diabetic patients and people who are looking for better quality with low glycemic
index. Hence we are concluding that MTU-2716, MTU-1140, MTU-2077, BPT-2270
and BPT-5204 have low GI along with good quality.
Description
D5428
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