Comparison of agronomic characteristics and total phenolic content of native purple glutinous rice

• Main Authors: Khempet,S., Jongkaewwattana,S.
• Format: Article
• Published: Chiang Mai University 2015
• Subjects: Multidisciplinary
• Online Access: http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84872230773&origin=inward; http://cmuir.cmu.ac.th/handle/6653943832/38036
• Institution: Chiang Mai University

This research aims to study the variation of purple glutinous rice varieties in terms of development, yield and total phenolic content of rice grain. In addition, the relationship between them was also determined. Hierarchical cluster analysis by average linkage method was used to sort varieties of rice on the basis of association of their grain yield and total phenolic content in grain. Twenty four varieties of native purple glutinous rice were grown under randomized complete block design with 3 replications. Phenological development namely heading and maturity date were recorded. Yield and yield components were collected at maturity. Samples of brown rice grains were analyzed to determine the amount of total phenolic content. Analysis results showed that among 24 varieties of native purple glutinous rice, growing degree days required from planting to heading was 1359-1657 degree Celsius (82-100 days). Grain yield ranged from 1.4-4.7 t/ha. The amount of total phenolic content in grains ranged from 128-735 mg/ml GAE per gram of brown rice grain. It was found that grain yield was positively correlated with 1,000 - grain weight at significant level P≤0.05 and negatively correlated with number of sterile grains per panicle at significant level P≤0.01. Results indicated that early maturing varieties tended to take longer period of time for grain filling duration. Moreover, late maturing varieties produced longer panicle length than those of early maturing varieties. Total phenolic contents were found positively correlated with panicle length at significant level P≤0.01. The cluster analysis result showed that purple glutinous rice varieties can be classified into four major clusters according to their grain yield and total phenolic content in grain. Analysis of results suggested that native purple glutinous rice varieties used in this study shown potential as genetic sources for rice improvement in order to breed a variety with satisfactory yield as well as high antioxidant in grain.