Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying

Title:

Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying

Creator:

Xu, B.-C., Deng, X.-P., Zhang, S.-Q., and Shan, L.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b4b57756-e612-4775-9449-5642c777df64
uuid:b4b57756-e612-4775-9449-5642c777df64
issn:0300-3604
doi:10.1007/s11099-010-0064-x

Subject:

botanika, botany, hydraulic root signal, root shoot ratio, nonhydraulic root signal, and water stress

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

This study compared physiological and growth responses to water stress of two legume species during the seedling stage. Potted alfalfa (Medicago sativa L. cv. Algonquin) and milkvetch (Astragalus adsurgens Pall. cv. Pengyang earlymaturing vetch) seedlings were grown under well-watered [soil water content (SWC) maintained at 14.92% daily] or water-stressed conditions (drying) for 15 days. Net photosynthetic rate (PN), transpiration rate (E) and stomatal conductance (gs) of both species decreased parabolically. When SWC decreased to 7.2% and 10.3%, gs values for alfalfa and milkvetch were significantly different from those of the respective well-watered plants (p<0.05). When SWC decreased to 6.6% for alfalfa and 6.8% for milkvetch, leaf water potentials (ψL) were significantly different from those of the well-watered plants (p<0.05). Thus the difference between the SWC thresholds for a nonhydraulic root signal (nHRS) and a hydraulic root signal (HRS) were 0.6% and 3.5% for alfalfa and milkvetch, respectively. Milkvetch had a lower gs than alfalfa for a given SWC (p<0.05). Although alfalfa seedlings had a higher dry mass (DM) and root:shoot ratio (R/S) than milkvetch in both treatments (p<0.05), we concluded that milkvetch seedlings had greater drought tolerance than alfalfa. and B.-C. Xu ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

481-487

Source:

Photosynthetica | 2010 Volume:48 | Number:4

Harvested from:

CDK

Metadata only:

false