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首页> 外文期刊>日本草地学会誌 >Changes in respiratory activity and dry matter disappearance with aging in napiergrass (Pennisetum purpureum Schumach)
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Changes in respiratory activity and dry matter disappearance with aging in napiergrass (Pennisetum purpureum Schumach)

机译：少年衰老呼吸活动和干物质消失的变化（Pennisetum Purpureum Schumach）

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摘要

In order to clarify the relationship between forage production and the quality of napiergrass (Pennisetum purpureum Schumach cv. Wruk wona) in detail, changes in the respiratory activity (R_0, mg CO_2 dry matter weight~(-1) hr~(-1) at 25 deg C) anddry matter disappearance (DMD), which were in conflict with each other during aging, were investigated on each leaf and stem-nodal position of the tiller with four or more elongated internodes. In some plants, all of the fully expanded leaf blades were cut off to block the transport of assimilate from the same phytomer at three months after planting. The correlation between the nodal position and R_0 in the leaf was weak, while the R_0 and DMD in the internode of the stem decreased with the decline in the nodal position, suggesting that accumulation of senescent parts was predominantly processed in the stem. Defoliation of leaf blades caused no significant change in R_0 of the whole stem, suggesting that growth respiration was small in the stem. The mean respiratory activity (mR_0) and DMD in the whole tiller decreased markedly with aging and were mainly dependent on changes in the stem rather than the leaf. In the internodal stem, the DMD decreased constantly with the increase in the nodal position,whereas R_0 was severely decreased at the uppermost four or five inter-nodes, and then, was parallel to DMD at the lower inter-nodes. This suggests that R_0 is closely correlated with the extent of DMD. The relationship between carbohydrate metabolism, R_0 and DMD in aging were discussed in accordance with the negligible effect of defoliation on the R_0. From these results, it is inferred in napiergrass with four or more elongated internodes, that aging and DMD should be predictable from the R_0.
机译：为了详细说明饲料生产与纳皮草（Pennisetum Purpureum Schumach CV的质量之间的关系。详细介绍了呼吸系统的变化（R_0，Mg CO_2干物质重量〜（-1）HR〜（-1）在25℃下，在衰老过程中彼此冲突的25℃）anddry物质消失（DMD）在每个叶片和茎的茎和茎的节点位置进行了四个或更多个细长的间。在一些植物中，所有完全膨胀的叶片被切断，以阻止种植后三个月在同一植物主角的同化植物的运输。叶片中的节点位置和R_0之间的相关性较弱，而茎的节间的R_0和DMD随着节点位置的下降而降低，表明衰老部分的积累主要在茎中加工。叶片脱落导致整个茎的R_0没有显着变化，表明茎中的生长呼吸很小。整个分蘖中的平均呼吸活动（MR_0）和DMD显着随老化而下降，主要取决于茎的变化而不是叶子。在芯片杆中，DMD随着节点位置的增加而不断下降，而R_0在最上面的四个或五个间节点处严重降低，然后，在下节点间平行于DMD。这表明R_0与DMD的程度密切相关。根据R_0脱落的可忽略效果讨论了碳水化合物代谢，R_0和DMD之间的关系。从这些结果中，它在拿帕皮拉斯中推断出四个或更多个细长的间，即老化和DMD应该从R_0预测。

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