Dry matter and nitrogen partitioning in rice genotypes varying in different nitrogen harvest index

Issue Date

12-2011

Abstract

To evaluate the contribution that dry matter and nitrogen (N) accumulation make when translocated tc grain during the grain-filling period between genotypes with high and low N harvest index (NHI), a pot experiment was conducted in the greenhouse under a uniform environment. Three high-NHI rice varieties (Yangdao6, R26, and R138) and three low-NHI varieties (Ceysvonic, R44, and R98) were used ir our experiment. Significant differences in dry matter and N accumulation, partitioning, and translocation were found between high- and low-NHI genotypes. Compared with low-NHI genotypes, high-NH genotypes had greater amount of dry matter and N translocation to grain, and higher dry matter and N translocation efficiency, on the other hand, high-NHI genotypes had the lower contribution ratios of pre- anthesis assimilate and N to the grain. Regression analysis showed that grain yield was closely associated with dry matter and N accumulation at heading and maturity stage, N and dry matter translocation in high-NHI genotypes. On the other hand, grain yield was closely associated with the contribution of pre-anthesis assimilate and N to grain in low-NHI genotypes. These suggested that pre- and post-anthesis assimilate and N accumulations, including assimilate and N translocations, were very important in improving the grain yield in high-NHI genotypes.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

36

Issue

3

Page

1-9

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Physical Description

graphs, tables, references

Language

English

Subject

dry matter accumulation, N accumulation, translocation, rice

En – AGROVOC descriptors

ORYZA; DRY MATTER; NITROGEN; BIOACCUMULATION; HARVEST INDEX

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