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Annals of Botany 81: 413-420, 1998
© 1998 Annals of Botany Company

Use of Physiological Indices as a Screening Technique for Drought Tolerance in OilseedBrassicaSpecies

A. KUMAR and D. P. SINGH

Department of Agronomy, CCS Haryana Agricultural University, Hisar, India

November 11, 1996 ; January 13, 1997 . November 18, 1997 .

Plants of 24 genotypes of fourBrassicaspecies (B. campestris,B. carinata,B. juncea,B. napus) were grown on stored soil water in a sandy loam soil under field conditions. Water use was recorded throughout the growing season. Leaf water potential ({psi}w), solute potential ({psi}s), relative water content (RWC), turgor potential ({psi}p), osmotic adjustment (reciprocal of slopebwhere lnRWC=a-b.ln{psi}s), leaf diffusive conductance (Kl), the difference between canopy and air temperature (Tc–Ta) and water loss from excised leaves (WLL) were measured at siliqua formation. Genotypes with higher osmotic adjustment maintained higher {psi}pand Kl, and lower canopy temperatures and WLL, than genotypes with lower osmotic adjustment (when decreasing soil water supply caused a lowering of RWC and {psi}w). The former genotypes also extracted more water from deeper soil layers (90–180 cm). The decline in {psi}swith decrease in RWC and {psi}wwas greater for high osmotic adjustment genotypes than for low osmotic adjustment genotypes. Seed yield was positively associated with Kl, 1/band the degree of leaf cooling, and negatively with WLL. However, since Tc-Taand WLL are easier to measure than 1/band Kl,Tc–Taand WLL measured around mid-day at the siliqua formation stage could be used to screen large numbers of germplasm lines ofBrassicaspecies for drought tolerance under field conditions.Copyright 1998 Annals of Botany Company

Brassica campestris,Brassica carinata,Brassica juncea,Brassica napus, drought tolerance, osmotic adjustment, transpirational cooling.


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