Screening of tall fescue genotypes for relative water content and osmotic potential under drought stress

Autor: Francis M. Kirigwi, Malay C. Saha
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Grassland Research, Vol 1, Iss 2, Pp 84-93 (2022)
Druh dokumentu: article
ISSN: 2770-1743
2097-051X
DOI: 10.1002/glr2.12021
Popis: Abstract Background Tall fescue (Festuca arundinacea Schreb.) is an important cool‐season perennial grass. Its persistence and forage yield can be severely affected by drought stresses during the hot, dry summers of the southern USA. Methods One thousand tall fescue genotypes were evaluated in the greenhouse for high relative water content (RWC) and low cell sap osmotic potential (OP). Fifty contrasting genotypes for the two traits were identified and used in further greenhouse and field studies. These genotypes were also screened with 30% PEG8000. Root and shoot characteristics were studied in 10 genotypes. Results The genotypes differed for RWC (33.7%–97.3%, mean: 79.7%) and had an almost fivefold difference in OP (−0.5 to −2.4 MPa, mean: −1.2 MPa). Significant variation (p
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