Gossypium herbaceum, a cultivated diploid cotton species (2n = 2x = 26, A1A1), has favorable traits such as excellent drought tolerance and resistance to sucking insects and leaf curl virus. G. australe, a wild diploid cotton species (2n = 2x = 26, G2G2), possesses numerous economically valuable characteristics such as delayed pigment gland morphogenesis (which is conducive to the production of...

The reniform nematode (Rotylenchulus reniformis) is a semi-endoparasitic organism in which the female penetrates the root cortex establishing a permanent feeding site (Robinson et al., 1997). It has become a serious threat to cotton (Gossypium hirsutum L.) production in Arkansas and the mid-South (Zhao et al., 2000) because yield losses in infested fields may exceed 50% under stress conditions ...

The genus Gossypium has a long history of taxonomic and evolutionary study. Much of this attention has been stimulated by the fact that the genus includes four domesticated species, the New World allopolyploids G. hirsutum and G. barbadense (2n = 52), and the Old World diploids G. arboreum and G. herbaceum (2n = 26). These cultivated species embody considerable genetic diversity, but this diver...

Host resistance to the Reniform Nematode (RN), Rotylenchulus reniformis Lindford and Oliveira, has been identified in diploid cottons Gossypium arboreum, G. herbaceum, and G. longicalyx (Stewart and Robbins, 1 ). Histological studies have identified two possible mechanisms of resistance: first, a darkened, necrotic syncytial cavity occurs (hypersensitive reaction); and second, a less frequent m...

The methanol extracts of the various plant parts were screened for anti-oxidant activity by thin layer chromatography using 2,2-diphenyl-1-dipicrylhydrazyl (DPPH) while in vitro antimicrobial evaluation was determined agar diffusion method and bioautographic technique Escherichia coli, Bacillus subtilis, Staphylococcus aureus Pseudomonas aeruginosa as test organisms; aqueous solvent served cont...