Liquan Jing , Yu Su , Yihan Zhao , Yang Cai , Mingyue Sun , Fucheng Zhao , Jianye Huang , Lianxin Yang , Yunxia Wang
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引用次数: 0
Abstract
Context or problem
The prevalence of duckweed (Lemna minor L.) growth in paddy fields (DGP) has escalated in recent years, potentially due to climate warming and the eutrophication of irrigation water. However, limited attention has been paid to its significant impact on rice production, particularly with regard to rice quality.
Objective or research question
A field experiment at two locations was conducted to evaluate the influence of DGP on grain quality and elucidate its possible reasons.
Methods
Three rice cultivars (JFY2, NJ5055, and YY1540) were cultivated in both control and DGP plots throughout the entire rice growing seasons. The grain quality traits, as well as the pasting and thermal properties of rice flour, were assessed alongside ecological factors related to paddy water.
Results
DGP notably enhanced the appearance quality of rice grains by reducing the chalky grain rate, chalkiness degree, and chalkiness area by 25.1 %, 34.4 %, and 13.1 %, respectively. Conversely, DGP reduced the breakdown, gel consistency, and ΔHgel of rice by 10.0 %, 10.2 %, and 14.1 %, respectively, leading to an 8.0 % decrease in the taste quality of cooked rice. DGP had no significant effect on the processing and nutritional quality of rice grain, including protein and amylose contents, phytic acid, and the bioavailability of mineral elements, but increased the milled rice yield (7.8 %). DGP-induced reductions in daytime temperature (-0.94 ℃), diurnal temperature difference (-0.88 ℃), and pH (-0.4) of paddy water could enhance the appearance quality of rice. The significant deterioration in rice palatability may be primarily attributed to the latter two factors rather than the changes in protein and amylose contents.
Conclusions
DGP significantly altered the ecological factors of paddy water, thereby improving the appearance quality of rice but greatly deteriorating its taste.
Implications or significance
The findings support sustainable rice production through rice-duckweed collaboration, providing a basis for better understanding the response of paddy field ecosystems to future climate change.
期刊介绍:
Field Crops Research is an international journal publishing scientific articles on:
√ experimental and modelling research at field, farm and landscape levels
on temperate and tropical crops and cropping systems,
with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.