ネピアグラス(Pennisetum purpureum Schumach.)とトウモロコシ(Zea mays L.), における地上部の水の通導抵抗の種間比較.

日本作物学会紀事

窪田 文武¹  長菅 輝義² 

[1] 九州大学大学院農学研究院;農業生物資源研究所

关键词: Hydraulic resistance;    水の通導抵抗;    Leaf sheath;    葉鞘;    Maize;    トウモロコシ;    Napiergrass;    ネピアグラス;    Nodal stem;    節;    Pressure flow meter;    高圧流量計;    Separate evaluation;    分別評価;    Stem-unit;    茎1単位;   

DOI  :  10.1626/jcs.74.179

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The hydraulic resistances of each organ in napiergrass and maize shoots were measured with a pressure flow meter. The results obtained were as follows: 1) Hydraulic resistances of the shoot, leaf and stem, Rshoot, Rleaf and Rstem, respectively, in napiergrass were significantly higher than those in maize. Particularly, Rstem in napiergrass was about four-fold larger than that in maize. 2) The cross sectional area of a stem (SA) was smaller in napiergrass than in maize, and the difference between napiergrass and maize in Rstem normalized by SA (RSstem) was smaller than that in Rstem. However, RSstem in napiergrass was still about two-fold larger than that in maize, indicating that napiergrass has a higher hydraulic resistance in the stem due to the synergistic effect of these two factors. 3) The hydraulic resistance of a stem was divided into three components, the resistance toward the leaf sheath of the nodal stem (γγ), the resistance toward the stem apex of the nodal stem (γa) and the resistance of the inter-nodal stem (γin). Both γγ and γa were high in napiergrass and the difference between napiergrass and maize was particularly large in γγ. These results suggested that a high RSstem in napiergrass was related with the water transport through the nodal stem. It was considered that a small stem diameter and high hydraulic resistance of nodal stem would result in a high resistance to water flow in napiergrass stem.

【 授权许可】

Unknown