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| Identification Index Screening and Comprehensive Evaluation for Alkali Tolerance of Common Bean Variety Resources in Seedling Stage |
| SU Yi，FENG Guojun，LIU Dajun，YANG Xiaoxu，YAN Zhishan，LIU Chang* |
College of Modern Agriculture and Ecological Environment，Heilongjiang University，Harbin 150081，Heilongjiang，
China |
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Abstract Saline-alkali stress is one of the important factors restricting common bean industry
development．Screening identification index for alkali tolerance of common bean in seedling stage has
great importance in breeding alkali-tolerant common bean varieties and promoting common bean cultivation
in saline-alkali land．This experiment took 35 common bean varieties as test materials，simulated 60
mmol · L-1 NaHCO3 solution as alkali stress，and treated common bean seedlings．Ten indicators including net
photosynthetic rate，intercellular CO2 concentration，stomatal conductance，malondialdehyde content，plant
height，root length，and dry/fresh weight of the above-ground part and underground part were measured，
respectively．The identification indicators for alkali tolerance of common bean in seedling stage were screened
by principal component analysis，and alkali tolerance of common bean in seedling stage was comprehensively
evaluated by fuzzy membership function and clustering analysis．The results showed that alkali stress could
significantly inhibit the growth of common bean seeldings．Eight indicators including root length，dry/
fresh weight of the above-ground part，dry/fresh weight of the underground part，net photosynthetic rate，
intercellular CO2 concentration and stomatal conductance could be used as main indicators for rapid identifying
alkali tolerance of common bean in seedling stage．These 35 varieties were divided into 5 types with different
alkali resistance through sorting the comprehensive evaluation value（D value）and clustering analysis．
‘Fenguan’was alkali-resitant variety．4 varieties such as‘14-4-1-3’ were relative alkali-tolerant varieties．
13 varieties such as‘Chiyu No.21’were medium alkali-tolerant varieties．16 varieties such as‘44-1-1’were
relative alkali-sensitive varieties．‘Tailaibaitiao’was alkali-sensitive variety．
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Received: 28 September 2021
Published: 27 December 2021
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