发芽
开枪
苗木
渗透压
化学
盐度
碱土
碱度
果聚糖
生理盐水
园艺
渗透性休克
农学
生物
食品科学
生物化学
蔗糖
土壤水分
有机化学
内分泌学
基因
生态学
作者
Rui Guo,Lianxuan Shi,Xuemei Ding,Yongjun Hu,Shangyi Tian,DeFu Yan,Shuai Shao,Yuan Gao,Rong Liu,Yunfei Yang
标识
DOI:10.2134/agronj2010.0022
摘要
We tested wheat ( Triticum aestivum L.) seedlings under five different saline and alkaline stress (9:1 molar ratio of NaCl/Na 2 SO 4 and 9:1 molar ratio of NaHCO 3 /Na 2 CO 3 , respectively) regimes of differing severity for 7 d, comparing growth, germination, and ionic balance of wheat seedlings, to elucidate the mechanism of alkaline stress (high pH) damage to wheat, and it physiological adaptive mechanism to alkaline stress. We found that alkalinity had a more severe effect on wheat seedlings than salinity, preventing germination before and after recovery, and severely inhibiting shoot and root growth. Plants responded to both saline and alkaline stress by accumulating Na + at the expense of K + , and by accumulating soluble osmolytes, but these effects were more pronounced under alkaline stress than saline stress. Alkaline stress also induced several specific responses such as the inhibition of fructan synthesis (fructan levels increased in response to salinity), the accumulation of organic acids, the accumulation of Ca 2+ and the depletion of H 2 PO 4 − The results suggest that specific damage caused by alkaline stress might reflect a massive influx of Na + , resulting in a severe deficit of negative charge. The plants respond by trying to restore the osmotic balance and synthesizing organic acids as counter‐ions to address the intracellular ion imbalance. These data provide important leads in the development of engineered wheat plants with improved stress tolerance.
科研通智能强力驱动
Strongly Powered by AbleSci AI