Abstract
ABSTRACT The objective of this research was to evaluate advanced potato clones for tuber yield, frying quality, plant vigor, and maturity, grown from minituber seeds, and to assess correlations between these traits. Eight advanced potato clones of Embrapa Potato Breeding Program (F11-09-03, F05-11-03, F54-11-06, F141-11-01, C2718-12-09, C2718-24-09, C2743-09-09, and CL308) and three commercial cultivars (Agata, Asterix and BRSIPR Bel) were evaluated. Experiments were carried out in autumn 2017, in Canoinhas-SC and Pelotas-RS. A randomized complete block design with four replicates was used. We used tuber seeds type IV (minibubers). We evaluated plant vigor, maturity, yield and number of marketable tubers, yield and number of total tubers, average tuber weight, specific gravity, and frying color. Individual and joint variance analyses revealed significant differences (p <0.05) among genotypes for all traits at both locations. The GxE (genotype x environment) interaction was significant for all traits. For the two locations together, clones F05-11-03, C2718-12-09, C2718-24-09 and the control cultivar BRSIPR Bel showed higher marketable tuber yields. The first two clones also showed tubers with high average tuber weight. Clone F54-11-06 showed the later maturity at both locations. Regarding the frying quality characteristics, only clone F141-11-01 showed a pattern comparable to that of the control cultivar Asterix. Also, clones with higher plant vigor had higher tuber yield, but late maturity. Frying quality traits were not correlated between them and among other traits.
Highlights
Rendimento de tubérculos, qualidade de fritura, vigor de plantas e ciclo vegetativo de clones de batata
Maturity, yield and number of marketable tubers, yield and number of total tubers, average tuber weight, specific gravity, and frying color
It is very important in the selection process to find the balance between tuber number and tuber size
Summary
Rendimento de tubérculos, qualidade de fritura, vigor de plantas e ciclo vegetativo de clones de batata. O objetivo com o presente trabalho foi avaliar caracteres de rendimento de tubérculos, de qualidade de fritura, vigor de planta e ciclo vegetativo de clones de batata cultivados a partir de minitubérculos, e a correlação entre essas características. Para os dois locais conjuntamente, os clones F05-11-03, C2718-12-09, C2718-24-09 e a cultivar testemunha BRSIPR Bel apresentaram os maiores rendimentos de tubérculos comerciais. Clones com maior vigor apresentaram maior rendimento de tubérculos, porém ciclo vegetativo mais tardio. Much importance is given to the tuber yield, aiming at greater profitability for producers (Silva et al, 2014) It is very important in the selection process to find the balance between tuber number and tuber size. Hortic. bras., Brasília, v.37, n.1, January-March 2019 for the development of new cultivars, but, careful selection is necessary for this trait, because clones with very vigorous plants usually have late maturity (Bradshaw et al, 2004). Silva et al (2007), evaluating potato segregating families, verified mediummagnitude correlations between plant vigor and plant size, tuber number and yield, indicating that more vigorous plants produce larger tubers, with higher numbers, and higher yields
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