STRUCTURAL AND NON-STRUCTURAL CARBOHYDRATES IN RELATION TO BACTERIAL BLIGHT RESISTANCE IN FORAGE
GUAR (CYAMOPSIS SP.)
SUMAN LATA, UDAI NARAYAN JOSHI AND NEHA WADHWA*
Department of Chemistry & Biochemistry
CCS Haryana Agricultural University,
Hisar-125 004 (Haryana), India
*(e-mail : nehawadhwa.wadhwa@gmail.com)
(Received : 06 July 2016; Accepted : 23 September 2016)
SUMMARY
The present investigation was conducted to study the changes in structural and non-structural carbohydrate contents and their role in bacterial blight (Xanthomonas axonopodis pv. cyamopsidis) resistance in forage guar. Guar crop (cvs. HG 563, FS 277, PNB and C. serrata) was raised in pots filled with 5 kg of sieved sandy soil in a naturally lit net house. Two sets of 15 pots of each genotype were maintained. One set was kept as control and another set was inoculated with X. axonopodis bacterial suspension at 30-35 days after sowing (DAS) and humidity was maintained before and after inoculation. Lesion size was observed to be in direct correlation with the disease susceptibility. Non-structural carbohydrate content decreased in inoculated leaves as compared to uninoculated one, while structural carbohydrates (NDF, ADF, hemicellulose, cellulose, lignin and silica) increased in inoculated leaves. This study enables to determine the relative disease resistance in relation to changes in carbohydrate content along with the role of carbohydrates in bacterial blight resistance in forage guar.
Key words: Bacterial blight, carbohydrate, guar, Xanthomonas