Growth and biomass production in potato grown in the hot tropics as influenced by paclobutrazol

• Published in: Plant growth regulation Vol. 45; no. 1; pp. 37 - 46
• Main Authors: Tekalign, T., Hammes, P.S.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.01.2005
• Subjects: Biomass; Dry matter; Flowers & plants; Growth rate; Leaves; Tropical environments; Vegetables
• ISSN: 0167-6903; 1573-5087
• DOI: 10.1007/s10725-004-6443-1

Two similar field trials were carried out during 2003 in a hot tropical region of eastern Ethiopia to investigate the effect of leaf and soil applied paclobutrazol on the growth, dry matter production and assimilate partitioning in potato. A month after planting paclobutrazol was applied as a foliar spray or soil drench at rates of 0, 2, 3, and 4 kg a.i. paclobutrazol ha^sup -1^. Plants were sampled during treatment application and subsequently 2, 4, 6 and 8 weeks after treatment application. The data was analyzed using standard growth analyses techniques. None of the growth parameters studied was affected by the method of paclobutrazol application. Paclobutrazol decreased leaf area index, crop growth rate, and total biomass production, and increased specific leaf weight, tuber growth rate, net assimilation rate, and partitioning coefficient of potato. At all harvesting stages, paclobutrazol reduced the partitioning of assimilate to the leaves, stems, and roots and stolons and increased allocation to the tubers. Although paclobutrazol decreased the total biomass production it improved tuber yield by partitioning more assimilates to the tubers. Paclobutrazol improved the productivity of potato under tropical conditions by redirecting assimilate allocation to the tubers.[PUBLICATION ABSTRACT]