| The classification and the inheritance of RVA profiles and the relationship between RVA profiles and rice quality were studied by determining RVA profiles of clonally propagated F2 population, DH population and many varieties. The distribution ranges were demarcated according to every index of eating quality of RVA profiles characteristics. And the relationship between rice quality and rice yield was analyzed in the end. The main results are as follows:1 There were A~F six types of RVA profiles. A type was feature profiles of waxy. Indica variety's feature profiles included B,C,E and F types. Japonica variety's mainly included D,E and F types.2 AAC was significantly correlated to RVA profiles characteristics and most eating quality indexes. RVA profiles of the rice varied with AAC, and there were differences among varieties with similar AAC. If the varieties with low or middle AAC, their RVA profiles characteristics could be used to evaluate their eating quality. In general, BDV of good eating quality variety was higher than that of bad one, on the contrary, SBV was lower than that of bad one.3 Four cross combinations made up of the CMS lines Xieqingzao A and Zhenshan 97A with 2 restorer lines Minghui 63 and 559, had the same aspects, respectively. HPV ,BDV, CPV, SBV, CSV, PeT of F1 were between those of its parents. PaT of F1 was lower than that of its parents. So the improvement of the quality of hybrid rice need the improvement of the CMS line and the restorer line together.4 In clonally propagated F2 population, all the characteristics of the RVA profiles had continuous variations. PKV was a typical quantitative character, while HPV, BDV, CPV, SBV and CSV, each might be controled by a major gene and several minor genes.5 Except PKV, other RVA profile characteristics had significant correlation with the main indexes of eating quality at 0.01 level. The correlation showed that the variety with lower HPV, CPV, SBV, CSV, PaT and higher BDV would have better hardness, adhesiveness, flavor, the texture character of cool rice and higher synthetic evaluation. Here ranges of Rice RVA profiles characteristics of different eating quality varieties were given. The eating quality could be concluded from RVA profiles characteristics.6 Except PKV and PeT, RVA profile's characteristics had significant correlation with milled rice rate, head milled rice rate of the indexes on milling quality at 0.01 level, while brown rice rate had no significant correlation with RVA profile's characteristics. RVA profile's characteristics had a close relationship with translucency and chalkiness rate. If rice with high translucency and low chalkiness rate had high BDV, low CPV, low SBV and low CSV, their eating quality might be good. Grain length, grain length/width had significant correlation with PaT only. And other indexes of appearance quality had no significant correlation with RVA profile's characteristics.7 To the same variety, AAC of the rice with chalkiness was higher than that without chalkiness's. But to GC, there was no regular difference. Except few variety, HPV, CPV, SBV and CSV of other varieties with chalkiness were lower than ones of varieties with no chalkiness. Chalkiness had no obvious effect on the gelatinization, and mainly affected the retrogradation. The rice with chalkiness could easily retrograd.8 RVA profiles characteristics had significant correlation with AAC and GC. Except PKV, other characteristics had maximum significant correlation with AAC and GC. RVA profiles characteristics had no significant correlation with GT.9 All the environment factors had certain influence on rice RVA profile. RVA profile characteristics of one variety planted in Hainan were higher than those of the same variety planted in Yangzhou. The different genotypes from a cross combination, had different response to the environment factors. The effects of the different varieties planted in different years or on different sowing date on rice RVA profile was different Most characteristics of Indica were...
|
PDF Full Text Request