1. Occurrence of perfect and imperfect grains of six japonica rice cultivars as affected by nitrogen fertilization.
- Author
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Qiao, Jiangfang, Liu, Zhenghui, Deng, Shanyu, Ning, Huifeng, Yang, Xiaoyu, Lin, Zhaomiao, Li, Ganghua, Wang, Qiangsheng, Wang, Shaohua, and Ding, Yanfeng
- Subjects
RICE varieties ,NITROGEN fertilizers ,SCANNING electron microscopes ,GLOBULAR proteins ,PRODUCT quality ,BROWN rice - Abstract
This study aims to quantify nitrogen (N) effect on occurrence of perfect rice kernel (PRK) and imperfect grains which includes white-belly rice kernel (WBRK), white-core rice kernel (WCRK), green rice kernel (GRK), opaque rice kernel (ORK), and other imperfect grains (OTHERS). Two-year field experiments involving six japonica rice cultivars and seven N treatments were performed. The structural differences between white-belly and white-core tissues were compared using scanning electron microscope. Averaged over cultivars, grain yield increased progressively with N rate. PRK increased with N rate in 2008, but decreased with increased N rate in 2009. WBRK and WCRK decreased as N rate increased for both years. High N input resulted in higher occurrence of GRK and OTHERS for both years. Most starch granules in white-belly tissues are intact and surrounded by globular protein bodies, with many air spaces between them; while in white-core tissues, starch granules are easily broken into many single granules and no protein bodies are visible. Our results suggest that N has suppressing influence on chalky grains but favorable effect on other imperfect grains, and indicate different mechanism between WBRK and WCRK. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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