春小麦胚芽伸长过程中渗透调节与能量代谢

Relationship Between Osmotic Adjustment and Energy Metabolism During Plumule Elongation of Spring Wheat

本文用PEG模拟水分亏缺对春小麦红芒麦和绵阳11号胚芽伸长过程中生长、膨压、渗透势、水势和渗透调节能力与ATP含量、能荷变化及能量代谢间的关系进行了研究。结果表明,通过降低能荷,改变分解代谢与合成代谢的比率,使渗透调节物质积累,增加了幼苗的吸水能力,从而使其在一定的ATP能量水平上维持缓慢生长;抗旱品种红芒麦在水分亏缺下成苗速率较快,能保持一定的ATP能量水平和能荷值,渗透调节和吸水能力都比较强。

PEG simulated water stress method was used for two spring wheat (Triticum aestivum) cultivars, Hongmang and Mianyang 11. Relations of plumule growth, pressure potential, osmotic potential, water potential, and osmotic adjustment to ATP content, energy charge, and energy metabolism during plumule elongation were studied. The results showed that, by reducing energy charge, increasing the ratio of catabolism to anabolism, accumulating the osmoticum, decreasing the osmotic potential and strengthening the water uptake ability, caused the seedlings to maintain its, slow growth rate on higher energy level. Hong mang, a drought resistant cultivar, could keep its high energy level and energy charge under water deficiency. Its ability to make osmotic adjustment and carry on water uptake were strong.