增温对保护性耕作下冬小麦籽粒蛋白质含量的影响

杨广; 孔祥飞; 侯瑞星; 欧阳竹

doi:10.11975/j.issn.1002-6819.2022.06.009

增温对保护性耕作下冬小麦籽粒蛋白质含量的影响

杨广¹,
孔祥飞^1,2,
侯瑞星^2,3,
欧阳竹^2,3

1.
石河子大学水利建筑工程学院，现代节水灌溉兵团重点实验室，石河子 832000
2.
中国科学院地理科学与资源研究所，生态系统网络观测与模拟重点实验室，北京 100101
3.
中国科学院大学，北京 100049

基金项目: 中国科学院战略性先导科技专项（XDA23050102）；国家自然科学基金资助项目（32071607，U1803244，51769030）；兵团科技攻关计划项目（2021AB021）；石河子大学科技项目（CXRC201801，RCZK2018C22）

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出版历程
- 收稿日期: 2021-12-13
- 修回日期: 2022-03-11
- 发布日期: 2022-03-30

Effects of warming on the protein content of winter wheat grains under the conservation tillage

1.
College of Water & Architectural Engineering, Shihezi University, Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production & Construction Group, Shihezi 832000, China
2.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modeling, Beijing 100101, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 冬小麦是世界主要粮食作物之一，气候变暖可能显著影响冬小麦籽粒蛋白质含量，但其影响机制还不明确。针对该问题，该研究在中国冬小麦主产区华北平原开展连续3 a（2017-2019）免耕（No Tillage，NT）和常规耕作（Conventional Tillage，CT）下的田间增温试验。结果表明，增温提前了冬小麦返青期，延长了冬小麦营养生长阶段时长，提高了冬小麦叶面积指数和群体净光合速率。2019年增温处理下冬小麦开花期茎叶氮素积累量提升了20.17%（CT）、99.21%（NT），花后茎叶氮素转移量提升了24.62%（CT）、134.21%（NT），茎叶氮素对籽粒的贡献率提升了2.43%（CT）、46.10%（NT）。增温影响了冬小麦产量构成，增温下冬小麦有效小穗数略减，部分年限千粒质量略增。NT处理增温增产，CT处理增温增产不明显，总的趋势为NT处理连续3 a平均产量低于CT处理。增温还显著提升了冬小麦籽粒蛋白质含量（P<0.05），连续3 a平均籽粒蛋白质含量提升了14.28%（CT）、17.39%（NT）。综上，研究表明增温会通过改变冬小麦生理特征显著促进氮素向籽粒转化，并且增温下冬小麦有效小穗数减少使得原本将进入更多籽粒中去的氮素都进入到最终有效籽粒中去，进而显著增加籽粒蛋白质含量。研究结果可为气候变化对冬小麦籽粒蛋白质含量的影响提供科学依据。
- 土壤 /
- 产量 /
- 增温 /
- 蛋白质 /
- 保护性耕作 /
- 冬小麦
Abstract: Abstract: Winter wheat (Triticum aestivum L.) is one of the major food crops in the world. Climate warming has dominated the growth and yield of winter wheat, particularly the protein formation and content of grains. But, the effects of warming on the protein content still remain unclear so far. Taking "Ji Mai 22" as the test material, this study aims to determine the specific effects of climate warming on the winter wheat growth and development, yield, and grain protein content. Climate warming was also simulated with an infrared warming device. Field warming experiments were conducted under the No Tillage (NT), and Conventional Tillage (CT) in the North China Plain for three consecutive years (2017-2019). The results showed that the open field warming reduced the overwintering period, indicating a significant shift in the regreening period. The nutritional growth period was then prolonged for the nitrogen accumulation time in the pre-anthesis period of plants. There was an increase in the Leaf Area Index (LAI) at the regreening-anthesis period, the net photosynthetic rate at the regreening-maturity period, and the aboveground dry mass of winter wheat. 20.17% (CT) and 99.21% (NT) of nitrogen accumulation in the winter wheat stems and leaves at the anthesis period, respectively, whereas, 24.62% (CT) and 134.21% (NT) of nitrogen transfer in the stems and leaves after anthesis increased by the warming in 2019, and the contribution of nitrogen in the stems and leaves contribution to seeds increased by 2.43% (CT), and 46.10% (NT). The NT warming increased the yield, where the NT yield was on average lower than that of CT. The CT yield of warmed winter wheat decreased by 2.14% and 4.62% in 2017 and 2018, respectively, and increased by 7.05% in 2019, whereas, the NT yield increased by 5.54% (2017), 34.44% (2018), and 42.25% (2019), respectively. The winter wheat yield in 2018 was significantly lower than that in 2017 and 2019. The reason was that the excessive precipitation in spring inhibited the winter wheat growth and development, leading to less yield in 2018. The temperature greatly contributed to the protein content of winter wheat grains, with an average increase of 14.28% (CT) and 17.39% (NT) for three consecutive years, compared with the control group. Therefore, the temperature promoted the conversion of nitrogen to the grain via the physiological characteristics of winter wheat. The reduction in effective spikelets number allowed the nitrogen for more grains to enter the final effective grain number, thus significantly increasing the grain protein content at high temperatures. The soil temperature under the NT was lower than that under the CT. The soil temperature was slower to rise in early spring, which affected the greening and early growth of wheat, resulting in the lower initial values of LAI, and net photosynthetic rate of winter wheat under the NT. The NT under the warming treatment reduced the post-anthesis soil temperature, but increased the soil water content, indicating the better wheat growth under a high post-anthesis temperature environment, compared with the CT. There was no significant difference in the grain protein content between CT and NT. This finding can provide a strong reference for the effect of climate warming on the protein content of winter wheat seeds under conservation tillage.
- soils /
- yield /
- warming /
- protein /
- conservation tillage /
- winter wheat

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