The effect of excess moisture on the germination of Spinacia oleracea L.
The effect of excess moisture on the germination of Spinacia oleracea L.
复制标题
过量水分对菠菜发芽的影响。
DOI：
10.1007/bf00385333
复制
发表时间：
1968
期刊：
影响因子：
4.3
通讯作者：
P. I. Orphanos
中科院分区：
文献类型：
--
作者：
W. Heydecker;P. I. Orphanos
研究了菠菜（Spinacia oleraceaL.）种子在甚至比最佳条件稍微潮湿的条件下生长，已经被追溯到在潮湿环境中，在包围真正种子的果皮周围和内部产生一层粘液。然而，当温度降低或环境的氧气压力升高时，或者在转移到通常过量的水中之前将完整的种子在过氧化氢中放置短时间时，这种湿种子可以容易地发芽。即使在没有增加氧气供应的情况下，种子也会在水下发芽，只要把覆盖胚根的果皮，甚至是一小部分果皮小心地去掉。没有证据表明已发现的水溶性抑制剂和研究结果是一致的假设，即发芽是依赖于一个足够高的氧气供应率的网站胚胎呼吸。在潮湿条件下形成的粘液形成了一个屏障，阻止氧气通过气体扩散或水对流转移到胚上，并将其限制在水扩散过程中，在这些条件下，氧气供应的速率可能达不到发芽所需的阈值水平。
The reversible inhibition of the germination of spinach (Spinacia oleraceaL.) seeds in conditions which are even slightly wetter than optimal has been traced to the production, in a wet environment, of a layer of mucilage around and within the fruit coat which surrounds the true seed. Such wet seeds may however germinate readily when the temperature is lowered, or the oxygen pressure of the environment is raised, or the intact seeds are placed for a short time in hydrogen peroxide before being transferred to what normally would be an excess of water. Even in the absence of an increased oxygen supply the seeds will germinateunder waterprovided the fruit coat, or even a small part of it where it covers the radicle, is crefully removed. No evidence has been found of a water soluble inhibitor and the findings are consistent with the hypothesis that germination is dependent on a sufficiently high rate of supply of oxygen to the sites embryonic respiration. The mucilage which is formed under wet conditions forms a barrier which prevents the transfer of oxygen to the embryo by gaseous diffusion or aqueous convection currents and restricts it to the process of aqueous diffusion, and under these conditions the rate of oxygen supply may not reach the threshold level required for germination.