Chloride is beneficial for growth of the xerophyte Pugionium cornutum by enhancing osmotic adjustment capacity under salt and drought stresses
Chloride is beneficial for growth of the xerophyte Pugionium cornutum by enhancing osmotic adjustment capacity under salt and drought stresses
复制标题
氯化物通过增强盐和干旱胁迫下的渗透调节能力，有利于旱生植物 Pugiium cornutum 的生长
DOI：
10.1093/jxb/eraa158
复制
发表时间：
2020-07-06
影响因子：
6.9
通讯作者：
Ma, Qing
中科院分区：
文献类型：
--
作者：
Cui, Yan-Nong;Li, Xiao-Ting;Ma, Qing
氯离子普遍存在于盐碱地中，其对植物的影响研究主要集中在其作为必需养分的作用以及过量积累时的毒性。然而，氯离子在植物适应非生物胁迫中的可能作用还没有很好的文献报道。以往的研究表明，旱生植物蒲公英的耐盐性可能与较高的氯离子积累有关。在本研究中，我们研究了氯离子在角藻耐盐和抗旱中的耐铬特性及其可能的生理作用。我们发现，在盐分条件下，角毛委陵菜能够在其地上部积累大量的氯离子，促进渗透调节和膨胀性的产生。阴离子通道阻断剂DIDS(4，4‘-二异硫氰基二苯乙烯-2，2’-二磺酸)显著抑制了叶片对氯离子的吸收，降低了叶片的氯离子含量及其对渗透调节的贡献，加剧了对盐胁迫的生长抑制。与糖类植物不同的是，当大量的氯离子被吸收和积累时，山毛委陵菜能够在其地上部维持NO3-的稳态。盐胁迫的加入缓解了渗透胁迫对金边莲的不利影响，因为氯离子的积累引起了较强的渗透调节能力。这些结果表明，山毛委陵菜是一种耐氯(-)的物种，能够吸收和积累氯离子，从而在盐和干旱胁迫下促进生长。
Chloride (Cl-) - is pervasive in saline soils, and research on its influence on plants has mainly focused on its role as an essential nutrient and its toxicity when excessive accumulation occurs. However, the possible functions of Cl- in plants adapting to abiotic stresses have not been well documented. Previous studies have shown that the salt tolerance of the xerophytic species Pugionium cornutum might be related to high Cl- accumulation. In this study, we investigated the Cr-tolerant characteristics and possible physiological functions of Cl- in the salt tolerance and drought resistance of P. cornutum. We found that P. cornutum can accumulate a large amount of Cl- in its shoots, facilitating osmotic adjustment and turgor generation under saline conditions. Application of DIDS (4,4'-diisothiocyanostilbene-2,2'-disulfonic acid), a blocker of anion channels, significantly inhibited Cl- uptake, and decreased both the Cl- content and its contribution to leaf osmotic adjustment, resulting in the exacerbation of growth inhibition in response to NaCl. Unlike glycophytes, P. cornutum was able to maintain NO3- homeostasis in its shoots when large amounts of Cl- were absorbed and accumulated. The addition of NaCl mitigated the deleterious effects of osmotic stress on P. cornutum because Cl- accumulation elicited a strong osmotic adjustment capacity. These findings suggest that P. cornutum is a Cl(-)tolerant species that can absorb and accumulate Cl- to improve growth under salt and drought stresses.