Leaf gas exchange of Pachyrhizus ahipa and P. erosus under water and temperature stress

Title:

Leaf gas exchange of Pachyrhizus ahipa and P. erosus under water and temperature stress

Creator:

Leidi, E. O.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:958902d0-08f4-4b77-92b7-fa7e0908465f
uuid:958902d0-08f4-4b77-92b7-fa7e0908465f
issn:0300-3604
doi:10.1023/A:1022622924446

Subject:

carbon isotope discrimination, photosynthesis, stomatal conductance, transpiration, water-use efficiency, and yambean

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Gas exchange, water relations, and leaf traits were studied in the tuberous-root producing legumes ahipa (Pachyrhizus ahipa) and yambean (P. erosus) under different environmental conditions. Differences in leaf traits (hairiness, leaf area, areal leaf mass, stomatal density) and paraheliotropism were found between ahipa and yambean. Under sufficient water supply, the increase in air temperature and decrease in air humidity increased stomatal conductance (gs) and net photosynthetic rate (PN) in yambean but reduced them in ahipa. In a drying soil (14 d after irrigation), inter-specific variation in gas exchange was only observed in the early morning, and yambean showed a greater sensitivity to water restriction than ahipa. High gs at low humidity increased PN of P. erosus but resulted in lower water-use efficiency (WUE). However, long-term WUE, estimated by leaf carbon isotope discrimination, showed little variation between species. Daily-irrigated ahipa and yambean grown in the greenhouse did not show significant differences in gas exchange. However, leaf temperature was significantly greater in yambean than in ahipa while a steepper relationship between E and PN and gs was observed in ahipa.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

375-381

Source:

Photosynthetica | 2002 Volume:40 | Number:3

Harvested from:

CDK

Metadata only:

false