胡麻生理生化代谢指标对干旱胁迫的响应及其模拟模型的研究

doi:10.12118/j.issn.1000-6060.2021.406

摘要/Abstract

摘要：

为进一步研究胡麻生理生化代谢指标响应干旱胁迫时对胡麻产量的影响,采用盆栽控水法模拟胡麻干旱胁迫,依据2013—2014年甘肃省定西市西巩驿镇胡麻试验数据,建立并检验胡麻干旱胁迫模型,模拟干旱胁迫时对胡麻生理生化指标及产量影响,利用均方根误差（RMSE）和决定系数（R²）描述模型拟合度。结果表明：（1）模型产量模拟值的RMSE为41.3159~155.6685 kg·hm^-2,平均值为80.1837 kg·hm^-2;R²为0.8929~0.9894,平均值为0.9387,该模型具有较好的拟合度、可行性也较强。（2）在重度干旱胁迫下,抗氧化代谢指标——超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）中,CAT活性表现趋势为下降,终花期POD活性增幅（26.09%~28.00%）最大;渗透调节的3种物质含量均显著上升,其中脯氨酸增幅最大,达236.22%。（3）呈现出极显著相关性的各指标有3组,分别是脯氨酸与叶绿素、丙二醛和CAT活性;可溶性蛋白与丙二醛和CAT活性;POD活性与SOD活性。胡麻生理生化指标响应不同程度干旱胁迫与胡麻的产量有极强的关联,此模型的建立是对胡麻生理生化指标响应干旱胁迫的科学补充,进一步为胡麻的高效生产管理及农业生产系统提供理论依据和支持。

关键词: 胡麻, 农业生产系统模拟器（APSIM）, 干旱胁迫, 生理生化, 模拟模型

Abstract:

Drought has been determined to be a stress factor that affects plant growth and development. In this study, we examined how drought stress has damaged agricultural production in northwestern China. Plants use photosynthesis, osmotic metabolism, and antioxidant metabolism indicators to cope with water deficit. To determine the effect of physiological and biochemical metabolic indices of flax on yield in response to drought stress, the pot-water control experiment was used to simulate the flax drought stress. The physiological and biochemical metabolic indices of flax response to drought stress model were constructed, calibrated, and evaluated according to the measured flax yield in Xigongyi Town, Dingxi City, Gansu Province, China, from 2013 to 2014. The fitting degree of the model was determined using root mean square error (RMSE) and the determination of coefficient (R²). The results showed that (1) the RMSE of the simulated yield was 41.3159-155.6685 kg·hm^-2, with the average value being 80.1837 kg·hm^-2; R² ranges from 0.8929 to 0.9894, with an average value of 0.9387. The model has a good fitting degree and strong feasibility. (2) Under severe drought stress, the increase in peroxidase (POD) at the final flowering stage (26.09%-28.00%) was deemed to be the largest, and the catalase (CAT) was noted to decrease among the antioxidant metabolic indices (SOD, POD, and CAT). The content of osmoregulation substances increased, with proline increasing the most, as it reached 236.22%. (3) Proline content was positively correlated with chlorophyll content, malondialdehyde content, and CAT. Soluble protein content was positively correlated with malondialdehyde content and CAT. A positive correlation exists between POD and superoxide dismutase (SOD). The physiological and biochemical indices of flax respond to drought stress, and the degree of stress is related to the yield of flax. This model is a scientific supplement to the physiological and biochemical indices of flax response to drought stress and provides a theoretical basis and support for the efficient production management of flax and in the agricultural production system.

Key words: flax, agricultural production systems simulator (APSIM), drought stress, physiology and biochemistry, simulation model

康佳,李玥,康亮河. 胡麻生理生化代谢指标对干旱胁迫的响应及其模拟模型的研究[J]. 干旱区地理, 2022, 45(3): 879-889.

KANG Jia,LI Yue,KANG Lianghe. Response of physiological and biochemical metabolism indices of flax to drought stress and its simulation model[J]. Arid Land Geography, 2022, 45(3): 879-889.

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参数	描述	数值
辐射截获/MJ·m^-2	作物冠层内各器官单位时间内所截获的辐射量	19.500
辐射利用率/g·MJ^-1·m^-2	单位土地面积上一定时间内植物光合作用积累的有机物所含能量与同期照射到该地面上的太阳辐射量的比率	1.400
CO₂因子	环境因素之一,浓度高低影响光合作用速率	0.050
光合作用水分胁迫因子	影响光合作用的限制因子	0.600
蒸腾效率系数	植物对水分的利用效率	0.005

指标	Pro	SP	Chl	MDA	CAT	POD	SOD
Pro	1.000
SP	0.611^*	1.000
Chl	0.767^**	0.458	1.000
MDA	0.724^**	0.763^**	0.709^**	1.000
CAT	0.872^**	0.750^**	0.522	0.579^*	1.000
POD	0.099	-0.287	0.069	-0.499	0.204	1.000
SOD	-0.042	-0.392	0.029	-0.521	0.058	0.912^**	1.000