TY  - EJOU
AU  - Islam, Mohammad Rafiqul 
AU  - Kamal, Mohd Mostofa 
AU  - Hossain, Mohammad Faruk 
AU  - Hossain, Jamil 
AU  - Azam, Mohammad Golam 
AU  - Akhter, Mst Masuma 
AU  - Hasan, M. Kamrul 
AU  - Al-Ashkar, Ibrahim 
AU  - Almutairi, Khalid F. 
AU  - Sabagh, Ayman EL 
AU  - Rahman, Md Atikur 
AU  - Iqbal, Muhammad Aamir 
AU  - Islam, Mohammad Sohidul 

TI  - Drought Tolerance in Mung Bean is Associated with the Genotypic Divergence, Regulation of Proline, Photosynthetic Pigment and Water Relation
T2  - Phyton-International Journal of Experimental Botany

PY  - 2023
VL  - 92
IS  - 3
SN  - 1851-5657

AB  - Drought is one of the critical conditions for the growth and productivity of many crops including mung bean
(<i>Vigna radiata</i> L. Wilczek). Screening of genotypes for variations is one of the suitable strategies for evaluating
crop adaptability and global food security. In this context, the study investigated the physiological and biochemical responses of four drought tolerant (BARI Mung-8, BMX-08010-2, BMX-010015, BMX-08009-7), and four
drought sensitive (BARI Mung-1, BARI Mung-3, BU Mung-4, BMX-05001) mung bean genotypes under wellwatered (WW) and water deficit (WD) conditions. The WW treatment maintained sufficient soil moisture
(22% ± 0.5%, i.e., 30% deficit of available water) by regularly supplying water. Whereas, the WD treatment
was maintained throughout the growing period, and water was applied when the wilting symptom appeared.
The drought tolerant (DT) genotypes BARI Mung-8, BMX-08010-2, BMX-010015, BMX-08009-7 showed a high
level of proline accumulation (2.52–5.99 mg g<sup>−1</sup> FW), photosynthetic pigment (total chlorophyll 2.96–3.27 mg g<sup>−1</sup>
FW at flowering stage, and 1.62–2.38 mg g<sup>−1</sup> FW at pod developing stage), plant water relation attributes including relative water content (RWC) (82%–84%), water retention capacity (WRC) (12–14) as well as lower water
saturation deficit (WSD) (19%–23%), and water uptake capacity (WUC) (2.58–2.89) under WD condition, which
provided consequently higher relative seed yield. These indicate that the tolerant genotypes gained better physiobiochemical attributes and adaptability in response to drought conditions. Furthermore, the genotype BMX-
08010-2 showed superiority in terms of those physio-biochemical traits, susceptibility index (SSI) and stress tolerance index (STI) to other genotypes. Based on the physiological and biochemical responses, the BMX-08010-2 was
found to be a suitable genotype for sustaining yield under drought stress, and subsequently, it could be recommended
for crop improvement through hybridization programs. In addition, the identified traits can be used as markers to
identify tolerant genotypes for drought-prone areas.
KW  - Mung bean; drought; proline; chlorophyll; water status; stress tolerance

DO  - 10.32604/phyton.2023.025138