Drought acclimation in wild and cultivated barley lines. [Hordeum spontaneum; Hordeum vulgare]

Conference · Wed May 01 04:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5561085

Glinka, Z ^[1]; Gunasekera, D; Mane, S; Berkowitz, G ^[2]

---

1. Tel Aviv, Univ. (Israel)
2. Rutgers, The State Univ. of New Jersey, New Brunswick (United States)

Wild barley (Hordeum spontaneum) seeds collected from arid and temperate regions in Israel were used, along with cultivated barley (H. vulgare) in a study to evaluate the range of acclimation responses to low leaf water potential ({Psi}w). Stress was imposed on plants by withholding water until {Psi}w was {minus}2 megapascals (MPa). Protoplast volume (PV) was measured at {minus}0.2 and {minus}2 MPa (imposed in vitro) in leaf tissue from well-watered and stressed plants. In well-watered plants, PV declined at {minus}2, as compared to {minus}0.2 MPa in all lines. With tissue from in situ stressed plants, PV reduction at {minus}2 MPa was not as great in some lines. The change in the extent of PV reduction occurring at {minus}2 MPa was used as an index of drought acclimation. The 13 wild barley lines were separated into high, medium, and low acclimation groups. Lines collected from arid regions scored in the high acclimation group. The cultivated barley lines scored in the medium and low groups. Relative water content decline at low leaf {Psi}w in situ was not a good indicator of acclimation; all lines responded similarly. Photosynthesis in situ was measured at high and low leaf {Psi}w in lines from the three groupings. Photosynthetic sensitivity to low {Psi}w was twice as great in low acclimation, as compared to high acclimation lines. It was concluded that PV response to low {Psi}w is a good indicator of drought acclimation in barley, and that wild lines offer a range of acclimation potential which could be used in breeding programs.

• OSTI ID: 5561085
• Report Number(s): CONF-9107184--
• Conference Information: Journal Name: Plant Physiology, Supplement; (United States) Journal Volume: 96:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540210 -- Environment
Terrestrial-- Basic Studies-- (1990-)
551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
BARLEY
BIOLOGICAL ADAPTATION
BIOLOGICAL STRESS
CEREALS
CHEMICAL REACTIONS
DROUGHTS
ENVIRONMENTAL EFFECTS
GRAMINEAE
LILIOPSIDA
MAGNOLIOPHYTA
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYSIOLOGY
PLANTS
SYNTHESIS