草业学报 ›› 2023, Vol. 32 ›› Issue (7): 175-187.DOI: 10.11686/cyxb2022352
• 研究论文 • 上一篇
张一龙1(), 李雯1, 喻启坤1, 李培英1,2,3(), 孙宗玖1,2,3
收稿日期:
2022-08-31
修回日期:
2022-09-19
出版日期:
2023-07-20
发布日期:
2023-05-26
通讯作者:
李培英
作者简介:
E-mail: 823797457@qq.com基金资助:
Yi-long ZHANG1(), Wen LI1, Qi-kun YU1, Pei-ying LI1,2,3(), Zong-jiu SUN1,2,3
Received:
2022-08-31
Revised:
2022-09-19
Online:
2023-07-20
Published:
2023-05-26
Contact:
Pei-ying LI
摘要:
干旱会影响植物氮代谢过程,从而制约其生长及品质。为了明确狗牙根在干旱胁迫下其叶与根氮代谢指标的变化,探讨狗牙根叶与根氮代谢对不同干旱胁迫的响应机制,筛选关键抗旱氮代谢指标,丰富狗牙根抗旱氮代谢理论,本试验将不同抗旱性狗牙根在不同干旱梯度处理下培养10 d,测定其叶及根有机氮化物(脯氨酸、可溶性蛋白、游离氨基酸)、无机氮化物(全氮、硝态氮、铵态氮)、氮代谢相关酶活性(硝酸还原酶、亚硝酸还原酶、谷氨酰胺合成酶、谷氨酸合成酶)等生理指标。结果表明:随着干旱胁迫加剧,各供试材料的叶及根全氮降低,有机氮化物增加,叶片硝态氮先降后升,根系硝态氮降低,叶、根铵态氮、氮代谢酶则呈先增后降趋势。抗旱材料在胁迫下因具有较高的氮代谢酶活性及无机氮化物含量,加速了氮代谢进程,致使抗旱材料叶、根的有机氮化物含量快速上升且显著高于敏旱材料。干旱下狗牙根通过对根系吸收的氮素进行转运再分配、同化,与其地上部分共同抵御干旱。冗余分析表明谷氨酸合成酶(GOGAT),谷氨酰胺合成酶(GS)与中度胁迫时抗旱材料叶、根的相关性较强,脯氨酸、游离氨基酸、可溶性蛋白与重度胁迫时抗旱材料有较强的相关性。通径分析得根系可溶性蛋白(决策系数为-0.739)、叶片(0.530)与根系游离氨基酸(0.498)与干旱下狗牙根抗旱性关联度高。本试验结果可丰富、补充狗牙根抗旱氮代谢响应研究,也可为其抗旱资源选育提供参考。
张一龙, 李雯, 喻启坤, 李培英, 孙宗玖. 狗牙根叶与根氮代谢对不同干旱胁迫的响应机制[J]. 草业学报, 2023, 32(7): 175-187.
Yi-long ZHANG, Wen LI, Qi-kun YU, Pei-ying LI, Zong-jiu SUN. Nitrogen metabolism response mechanism to different drought stresses in leaves and roots of Cynodon dactylon[J]. Acta Prataculturae Sinica, 2023, 32(7): 175-187.
图1 干旱胁迫对狗牙根叶、根有机氮化物的影响不同小写字母表示相同处理不同材料间差异显著(P<0.05),不同大写字母表示相同材料不同处理间差异显著(P<0.05),CK:正常灌溉,MD:中度干旱胁迫,SD:重度干旱胁迫,下同。Different lowercase letters indicate significant differences among different materials under the same treatment (P<0.05), and different capital letters indicate significant differences among different treatments of the same material (P<0.05). CK: Normal irrigation; MD: Moderate drought stress; SD: Severe drought stress, the same below.
Fig.1 Effects of drought stress on organic nitrogen compounds in leaf and root of C. dactylon
图4 干旱胁迫对狗牙根叶、根氮代谢指标的热图聚类分析及主成分分析
Fig.4 Heat map cluster analysis and principal component analysis of nitrogen metabolism indexes of leaf and root of C. dactylon under drought stress
图5 干旱胁迫下狗牙根叶、根氮代谢指标的冗余分析图中红色表示正常灌溉下供试材料,绿色表示中度干旱,黑色表示重度干旱。In the figure, red represents the tested material under normal irrigation, green represents moderate drought, and black represents severe drought.
Fig.5 Redundancy analysis of nitrogen metabolism indexes in leaf and root of C. dactylon under drought stress
作用因子 Action factor | 相关系数 Correlation coefficient | 直接通径系数 Direct path coefficient | 间接通径系数 Indirect path coefficient | 合计 Total | 决策系数Decision coefficient | ||||
---|---|---|---|---|---|---|---|---|---|
根系硝态氮Root NO3--N | 根系游离 氨基酸 Root FAA | 根系可溶性蛋白 Root SP | 叶片游离 氨基酸 Leaf FAA | 根系全氮 Root N | |||||
根系硝态氮Root NO3--N | -0.835 | -0.320 | -0.286 | 0.222 | -0.394 | -0.056 | -0.514 | 0.432 | |
根系游离氨基酸Root FAA | 0.792 | 0.433 | 0.211 | -0.419 | 0.525 | -0.056 | 0.260 | 0.498 | |
根系可溶性蛋白Root SP | 0.420 | -0.537 | 0.132 | 0.338 | 0.505 | -0.019 | 0.957 | -0.739 | |
叶片游离氨基酸Leaf FAA | 0.743 | 0.594 | 0.212 | 0.382 | -0.457 | 0.011 | 0.149 | 0.530 | |
根系全氮Root N | -0.499 | -0.153 | -0.117 | -0.120 | -0.066 | -0.043 | -0.346 | 0.129 |
表1 叶片相对电导率与狗牙根叶、根氮代谢指标的通径分析
Table 1 Path analysis of leaf relative electrical conductivity and nitrogen metabolism indexes in root and leaf of C. dactylon
作用因子 Action factor | 相关系数 Correlation coefficient | 直接通径系数 Direct path coefficient | 间接通径系数 Indirect path coefficient | 合计 Total | 决策系数Decision coefficient | ||||
---|---|---|---|---|---|---|---|---|---|
根系硝态氮Root NO3--N | 根系游离 氨基酸 Root FAA | 根系可溶性蛋白 Root SP | 叶片游离 氨基酸 Leaf FAA | 根系全氮 Root N | |||||
根系硝态氮Root NO3--N | -0.835 | -0.320 | -0.286 | 0.222 | -0.394 | -0.056 | -0.514 | 0.432 | |
根系游离氨基酸Root FAA | 0.792 | 0.433 | 0.211 | -0.419 | 0.525 | -0.056 | 0.260 | 0.498 | |
根系可溶性蛋白Root SP | 0.420 | -0.537 | 0.132 | 0.338 | 0.505 | -0.019 | 0.957 | -0.739 | |
叶片游离氨基酸Leaf FAA | 0.743 | 0.594 | 0.212 | 0.382 | -0.457 | 0.011 | 0.149 | 0.530 | |
根系全氮Root N | -0.499 | -0.153 | -0.117 | -0.120 | -0.066 | -0.043 | -0.346 | 0.129 |
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