Strategies for indica rice adapted to high-temperature stress in the middle and lower reaches of the Yangtze River

Abstract

High temperatures caused by climate warming severely affect the grain yield and quality of rice. In this study, the rice cultivars Longliangyou Huazhan (LLYHZ) and Quanliangyou 2118 (QLY2118) were selected as the experimental materials for investigation of an optimal cultivation system under high-temperature treatment. In addition, the heat-resistant cultivar Huanghuazhan (HHZ) and heat-sensitive cultivar Huiliangyou 858 (HLY858) were chosen as the experimental materials to study the effects of exogenous plant growth regulators on heat stress responses under high-temperature treatment. The results showed that mechanical transplanting of carpet seedlings and delayed sowing effectively increased the leaf area index and reduced the canopy temperature of LLYHZ and QLY2118. Furthermore, carpet seedling mechanical transplantation and delayed sowing improved grain yield and quality. Spray application of five plant growth regulators revealed that brassinolide and salicylic acid had the strongest effects on significantly improving antioxidant enzyme activities in the panicle, which would reduce the damage caused by the accumulation of reactive oxygen species and enhance plant tolerance of high-temperature stress. In addition, brassinolide and salicylic acid enhanced the percentage of anther dehiscence and percentage seed set. In this study, a set of simplified eco-friendly cultivation techniques for single-season indica rice adaptation to high-temperature stress was established. These results will be of great importance in alleviating the effects of high-temperature stress on rice production.

Optimum seeding density and seedling age for the outstanding yield performance of Japonica rice using crop straw boards for seedling cultivation

“…To counter these effects, mechanically transplanted rice should be transplanted at the optimal age to achieve a larger leaf area, thereby enhancing photosynthetic capacity and laying the groundwork for increased biomass accumulation ( Liu et al., 2017 ). Additionally, the accumulation of dry matter from the heading to maturity stages significantly dictates rice yield ( Huang et al., 2019 ; Zhang et al., 2023 ). Under the same seeding density, dry matter weight trends upward initially then declines with seedling age during the HS-MS period ( Figures 4 , 5 ), consistent with the trends observed in photosynthetic potential and growth rates ( Figure 3 ).…”

Morphological and physio-biochemical responses under heat stress in cotton: Overview

“…Despite being researched separately, the combined consequences of drought and elevated temperatures on cotton have not been extensively found. Despite the fact that combined impacts were recently examined in a variety of crops, such as Tomato, [ 14 ], Maize (E. [ 3 ]), Arabidopsis thaliana [ 15 ], Tobacco [ 16 ], wheat ( Triticum aestivum L.) [17] , rice (M. [ 18 ]) and sorghum (Rajendra [ 19 ]). Plants are being exposed to an increased variety of abiotic and biotic stress combos due to climate change and potentially associated climatic variances, all of which will have significant adverse impacts on their development and production (H. [ 20 ]).…”

Quality changes in Chinese high-quality indica rice under different storage temperatures with varying initial moisture contents

“…The Asian cultivated rice can be divided into two subspecies of rice, indica and japonica. Indica rice is more suitable for growth in tropical and subtropical regions, while japonica rice is mainly distributed in temperate and cooler regions ( 3 , 4 ).…”