Musgrave M E, Vanhoy M A
Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge 70803.
Can J Bot. 1989;67:2391-5. doi: 10.1139/b89-305.
Mung beans (Phaseolus aureus Roxb.) were grown for 2 weeks in gravel-vermiculite soilless mix in a growth chamber and subjected to a 1-week waterlogging period followed by a 1-week recovery period. Sequential harvests were made to determine the time course of effects of waterlogging and subsequent recovery on growth parameters by techniques of growth analysis. Root dry matter was the first to be affected, along with an increase in leaf dry matter and specific leaf weight. After a 1-week waterlogging period, specific leaf weight had more than doubled in the stressed plants. Leaf area declined in relation to the control plants as did the ratio of root dry matter to shoot dry matter. During the recovery period there was an increase in the dry matter allocation to the roots relative to the shoot. Specific leaf weight fell to control levels although the rate of leaf area elaboration did not increase during this time, suggesting a redistribution of stored assimilates from the leaves. Net assimilation rate increased during the waterlogging period, probably due to a restriction in root metabolism and reduced translocation out of the leaf rather than to an increase in photosynthesis. Net assimilation rate of waterlogged plants was severely reduced compared with control plants during the recovery period. Both relative growth rate and leaf area duration declined during the waterlogging period and declined further subsequent to the waterlogging treatment. The results illustrate the interrelationships between root and shoot carbon budgets in mung bean during response to the stress of waterlogging.
绿豆（Phaseolus aureus Roxb.）在生长室的砾石 - 蛭石无土混合物中生长2周，经历1周的淹水期，随后是1周的恢复期。通过生长分析技术进行连续收获，以确定淹水及其后的恢复对生长参数影响的时间进程。根干物质是首先受到影响的，同时叶干物质和比叶重增加。在1周的淹水期后，受胁迫植株的比叶重增加了一倍多。与对照植株相比，叶面积下降，根干物质与地上部干物质的比率也下降。在恢复期，相对于地上部，根的干物质分配增加。比叶重降至对照水平，尽管在此期间叶面积扩展速率没有增加，这表明储存的同化物从叶片中重新分配。在淹水期净同化率增加，这可能是由于根系代谢受限和叶片中转运减少，而不是光合作用增加。与对照植株相比，淹水植株在恢复期的净同化率严重降低。在淹水期相对生长率和叶面积持续时间均下降，淹水处理后进一步下降。结果说明了绿豆在应对淹水胁迫时根和地上部碳预算之间的相互关系。
