Comparative evaluation ofGossypium arboreumL. andGossypium hirsutumL. genotypes for drought tolerance

Abstract

Drought stress negatively affects the cotton production all over the world. The negative impact of drought varies for different species due to some morphological and root attributes that help some species to better stand under drought. But the extent of disturbance varies for different cotton species. To find out such variation, two cotton species (Gossypium hirsutum and Gossypium arboreum) were studied under normal and drought conditions for 2 years. Two genotypes for each species were included, i.e. PC-1 and COMILLA (G. arboreum) and IUB-13 and IUB-65 (G. hirsutum). The experiment was laid out under a completely randomized design following factorial arrangement. Genotype × treatment × year interaction of cotton genotypes was studied for different root, morphological, physiological and fibre-related traits. Traits such as above ground dry biomass, above ground fresh biomass, chlorophyll contents, leaf area, seed cotton yield, sympodial branches/plant, fibre strength and ginning out-turn were higher in G. hirsutum genotypes as compared to G. arboreum genotypes. However less reduction under drought in all above mentioned traits was recorded for G. arboreum, than G. hirsutum. Furthermore, root traits; primary root length, lateral root numbers, root fresh weight and root dry weight were enriched under drought condition in G. arboreum genotypes than in G. hirsutum genotypes, which is a clear manifestation of higher drought tolerance ability in G. arboreum genotypes transferrable to G. hirsutum genotypes through interspecific crossing or other means.

Comparative assessment of okra and non-okra leaf cotton (Gossypium hirsutum L.) genotypes for drought tolerance

“…Pearson correlation among morphological, physiological, roots and bre quality traits was computed in both non-stressed and water stressed conditions by using XLSTAT 2014. The following method was used to determine the reduction/change in all above mentioned studied attributes in both conditions (Iqbal et al, 2019); Reduction (%) in stressed conditions = {1 -(Performance under stressed /Performance under non-stressed)} × 100.…”

Differential seedling growth and tolerance indices reflect drought tolerance in cotton

“…Author details 1 State Key Laboratory of Cotton Biology, Institute of Cotton Research (ICR), Chinese Academy of Agricultural Sciences (CAAS), Anyang 455000, China. 2 Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the M inistry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China. 3 School of Agricultural Sciences, Zhengzhou University, Zhengzhou 450001, China.…”

“…Water availability is the key factor for any crop production system. However, the water-scarcity conditions seriously threaten sustainable cotton production [ 2 ]. Thus, drought stress is the most deleterious factor limiting plant growth and final crop yield in cotton [ 3 ].…”

“…Various studies have been reported that G. hirsutum [ 18 ], G. barbadense [ 19 ], and G. arboreum [ 2 ] are sensitive to abiotic stress conditions. Different cotton species are well known for possessing additional favorable attributes for cotton yield and adaptability.…”

“…Different cotton species are well known for possessing additional favorable attributes for cotton yield and adaptability. G. barbadense L. has extralong fiber [ 20 ], and G. arboreum L. has more biotic and abiotic stress tolerance with more adaptability to arid and semi-arid conditions [ 2 , 21 ]. However, the comparative exploration of seedling responses of different Gossypium species under drought stress is still missing.…”