Cold-hardened winter wheat (Triticum aestivum L. cv. Fredrick) and winter barley (Hordeum vulgare L. cv. Dover) were exposed to total flooding at 2 C. Dover seedlings were damaged more quickly than Fredrick, and after 3 weeks of flooding the survival of Dover was reduced to 10% and Fredrick to about 50%. Tissue moisture was slightly greater in Dover than Fredrick throughout the 4-week flooding period. Carbon dioxide and ethanol accumulated throughout the 4-week flooding period in both cultivars. Lactic acid increased rapidly during the 1st week of flooding, and remained relatively constant during the remainder of the flooding period. Oxygen consumption of seedling shoot tissue after exposure to flooding declined abruptly after only 1 day of flooding, but recovered somewhat during the subsequent 2 weeks. The effect of flooding was more pronounced on the ultrastructure of Dover than Fredrick. Although proliferation of endoplasmic reticulum was observed in the early stages of flooding in both cultivars, the occurrence of distinct parallel arrays and concentric whorls of membranes was prevalent in the flooded barley. Severe ultrastructural damage to a large proportion of apical cells in both cultivars was observed after 2 to 3 weeks of flooding.
展开▼
机译：将冷硬的冬小麦（Triticum aestivum L. cv。Fredrick）和冬大麦（Hordeum vulgare L. cv。Dover）在2°C的温度下完全淹没。在淹水3周后，Dover幼苗受到的破坏比Fredrick更快。 Dover的生存率降低到10％，Fredrick的生存率降低到50％。在整个4周的淹没期内，多佛的组织水分略高于弗雷德里克。在两个品种的整个4周淹没期间，二氧化碳和乙醇积累。乳酸在水灾的第一周迅速增加，在水灾的剩余时间内保持相对恒定。浸水仅1天后，苗苗组织的耗氧量突然下降，但在随后的2周中有所恢复。洪水对多佛的超微结构的影响比弗雷德里克更为明显。尽管在两个品种的浸水早期都观察到内质网的增殖，但在浸水的大麦中普遍存在明显的平行排列和同心的膜轮。淹没2至3周后，两个品种中的大部分根尖细胞都遭受了严重的超微结构破坏。
展开▼
