USE OF POL YETHYLENE GL YCOL (PEG) 8000 FOR IN VITRO SCREENING OF POTATO GENOTYPES FOR DROUGHT TOLERANCE: I. ROOT AND SHOOT GROWTH

• Main Author: Perpustakaan UGM, i-lib
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2006
• Subjects: Jurnal i-lib UGM
• Online Access: https://repository.ugm.ac.id/28421/; http://i-lib.ugm.ac.id/jurnal/download.php?dataId=11484
• Institution: Universitas Gadjah Mada

The overall goal of this study was to evaluate whether growth reduction of potato genotypes, expressed in root length density reduction (RLDR), root dry weight reduction (RDWR), shoot dry weight reduction (SDWR), root-toshoot ratio reduction (RSR) could be used to select potato genotypes for drought tolerance. Twelve potato genotypes grown in vitro were exposed to 0% and 8% PEG8000, their growth reductions at 8% PEG8000 were calculated, and then were ranked from the least and the most reduced in growh. . The results showed that Kennebec,known to be drought tolerant in previous studies, showed the least growth reduction as seen in the RLDR (12.4% and 20.9%), RDWR (20.4% and 38.1%), SDWR (11.7% and 47.8%, and RSR (-120.1% and -18.2%). Furthermore, the linear correlations of RLDR (~ = 0.89*) and RDWR (~ = 0.78*) results over runs of the experiment were significant, suggesting that the results were consistent. RLDR and RDWR show promise for selecting potato genotypes grown in vitro for drought tolerance. The linear relationship between RLDR and RDWR was also significant (~= 0.86*), suggesting that either one was good for creening.