TITLE:
Leaf Water Status and Its Relationship with Reproductive Responses of Common Bean (Phaseolus vulgaris L.) Genotypes under Water Stress
AUTHORS:
Apurba Kanti Choudhury, Md Abdul Karim, Md Moynul Haque, Qazi Abdul Khaliq, Jalal Uddin Ahmed, Mohammad Mofazzal Hossain
KEYWORDS:
Leaf Water Potential, Pod Setting Ratio, Relative Water Content
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.11,
May
16,
2014
ABSTRACT:
Two tolerant (BB24
and BB43) and two susceptible (BARI busbean-2 and BB04) genotypes of common
bean (Phaseolus vulgaris L.) were
evaluated for their water status and its relationship with reproductive responses under continuous water stress (50% field
capacity) and control (80% field capacity) conditions in a net house
covered with polyethylene sheet at the Bangabandhu Sheikh Mujibur Rahman
Agricultural University, Bangladesh. Under water stress condition, the
susceptible genotype namely BB04 exhibited more negative leaf water potential
(LWP) which was followed by that of BARI bushbean-2 in all the time of the day
except at noon. The tolerant genotype namely BB24 exhibited less negative LWP
at noon. The tolerant genotypes maintained higher relative water content (WRC)
than the susceptible ones from dawn to dusk. The relationship between RWC and
LWP was examined separately for four genotypes under water stress condition.
The genotype BB24 showed a smaller decrease in RWC with more negative LWP than
BB04. Water stress reduced pod setting ratio. The relationship between the leaf
water status and reproductive responses showed that the genotype with a little
reduction in mid-day drop of RWC or with high mid-day RWC displayed a high pod
setting ratio.