Table 3.

Summary of biotic and abiotic stress tolerance traits of wild relatives of cultivated cotton species.

Trait	Crop wild relative	Putative cause of resistance/tolerance
TOLERANCE TO BIOTIC STRESSES
Insect tolerance
Helicoverpas Spp.	G. somalense	Smooth leaf type
Tolerance to Jassids	G. barbadense “Carpulla” G. barbadense “Tanguis” G. hirsutum “MU 8b” G. hirsutum var. “Marie-galante” G. hirsutum var. “St. Ignatius” G. raimondii	Hairiness trait controlled by genes, designated as H1(“Carpulla,” “Tanguis,” “MU 8b”,” “Marie-galante,” and “St. Ignatius”) and H6 (G. raimondii) Low Tannin/High Phenol content (G. anomalum, G. armourianum, G. raimondii, G. davidsoni, G. thurberi)
Tolerance to fleahopper	G. hirsutum “Pilose”	Pilose trait and square structure impacting stylet penetration
Tolerance to thrips	G. tomentosum G. barbadense “Pima S-7”	Unknown
Nectariless	G. sturtianum	Cotton plant without the extrafloral and floral nectary glands do not attract insects
Glandless-seed and glanded-plant	G. tomentosum	The presence of pigment glands filled with gossypol and its derivatives helps to protect cotton plants from phytophagous pests
Nematode tolerance
Reniform nematode resistance	G. longicalyx G. somalense G. stocksii G. arboretum G. barbadense “GB713” cultivar	Resistance gene in Chr 11 from G. longicalyx and in 21 from G. barbadense “GB713”
Root-knot nematode resistance	G. hirsutum “M-315 RNR”	Resistance genes in Chr-11 and Chr 14
Disease tolerance
Bacterial blight resistance	G. arboreum	Bacterial blight resistance gene, B6.
Rust resistance	G. anomalum
Cotton Leaf Curl Virus resistance	G. stocksii G. herbaceum	Unknown
Fusarium Wilt resistance	G. austral G. sturtianum G. darwinii	Unknown
Verticillium Wilt resistance	G. austral G. thurberi G. darwinii	Unknown
TOLERANCE TO ABIOTIC STRESSES
Drought tolerance	G. tomentosum G. herbaceum G. darwinii	Unknown
Salt tolerance	G. tomentosum G. davidsonii G. aridum	Unknown
Heat tolerance	G. tomentosum	Unknown