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RESEARCH ARTICLE

Physiological and biochemical indicators for assessing nitrogen-use efficiency in rice (Oryza sativa) genotypes under dry direct seeding

Rupinder Kaur A C , Seema Bedi A , Gulshan Mahajan A , Gurpreet Kaur A and Bhagirath Singh Chauhan B
+ Author Affiliations
- Author Affiliations

A Punjab Agricultural University, Ludhiana 141 004, Punjab, India.

B The Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI), Toowoomba, Qld 4350, Australia.

C Corresponding author. Email: rupinderkaur2088@gmail.com

Crop and Pasture Science 67(11) 1158-1167 https://doi.org/10.1071/CP16204
Submitted: 4 June 2016  Accepted: 10 September 2016   Published: 7 October 2016

Abstract

To achieve high productivity of labour and water in rice cropping, farmers in South Asia have recently shown more interest in dry direct-seeded rice (DSR). An understanding of physiological and biochemical traits associated with high grain yield and efficiency of nitrogen (N) use is important to the development of genotypes for DSR. We investigated this issue with rice genotypes adapted to DSR in response to N rates. A 2-year study was conducted in a factorial randomised complete block design with eight genotypes and two N rates (75 and 150 kg N ha–1). Almost all of the physiological and biochemical traits studied (e.g. plant height, chlorophyll content, panicle weight, soluble sugars, starch) in DSR improved with increasing N from 75 to 150 kg ha–1, resulting in a 6% increase in yield at 150 kg N ha–1 relative to 75 kg N ha–1. Partial factor productivity of N was highest for the genotype IET-23455 (72.4 kg kg–1) and lowest for the genotype AAUDR (37.4 kg kg–1). Our results suggest that genotypes such as IET-23455 can maintain grain yield at low N rates as N-efficient genotypes. The greater biochemical activity (nitrate reductase and glutamine synthetase, sugar, protein and proline) and higher photosynthetic N-use efficiency at low N rates could be used in selection for N-efficient rice genotypes for DSR.

Additional keywords: aerobic rice, chlorophyll content, glutamine synthetase, nitrate reductase, proline.


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