Abstract
ABSTRACT The aim of this study was to characterize the seeds quality and the plant development of F1 and F2 generations of hybrid UENF/Caliman 01 papaya, and the relations between the physic-chemical and physiological quality of seeds, vegetative and reproductive development of plants in the field for 360 days, and fruit quality. The relative contribution (Cr %) to the genetic divergence for each characteristic was estimated. For those with higher importance for each group (Cr = 25%), the Pearson correlation and the canonical correlation analysis were applied. The F1 seeds showed higher physic-chemical and physiological quality, with greater length (0.55 cm), sugar and lipid levels (5.13 and 11.58 mg g-1, respectively), germination and normal seedlings percentages (94 and 98.31%, respectively). The F2 plants showed higher stem diameter (81.08 mm), fruits insertion height (184.8 cm) and fruits number (11.73). It was observed that higher levels of lipid in the seeds were associated with lower fruits number. Lower levels of sugar and lipid of the seeds and lower speed germination index were associated with lower survival. Thus, seed quality is associated with survival of hybrid UENF/Caliman 01 papaya plants in the field, but it does not have relation with the vegetative and reproductive development of plants.
Highlights
The papaya improvement research has been aimed to the development of national hybrids, appearing a demand for these genotypes evaluation for their agronomic potential. (MARIN et al, 2006 a, b; DIAS et al, 2011; DANTAS et al, 2015; LUZ et al, 2015).The papaya hybrids are obtained by the crossing between progenitors with different genetic pools, resulting in high hybrid vigor materials (MACEDO et al, 2013)
Plants generated from the planting of hybrids F1 seeds show ideal morphophysiological characteristics while the planting of F2 seeds can generate plants that show segregation and heterogeneity in the orchard, which compromises the quality of crops (ANDRADE; PEREIRA, 2005; MARIN et al, 2006 a, b)
The physiological characterization of the seeds highlighted that the F1 seeds showed greater vigor, with higher total germination percentages (F1 = 94% and F2 = 86%, of the counts performed at 7 (F1 = 6% and F2 = 0%) and at 14 days (F1 = 94% and F2 = 24%) and normal seedlings (F1 = 98.31% and F2 = 81.80%)
Summary
The papaya improvement research has been aimed to the development of national hybrids, appearing a demand for these genotypes evaluation for their agronomic potential. (MARIN et al, 2006 a, b; DIAS et al, 2011; DANTAS et al, 2015; LUZ et al, 2015).The papaya hybrids are obtained by the crossing between progenitors with different genetic pools, resulting in high hybrid vigor materials (MACEDO et al, 2013). The papaya improvement research has been aimed to the development of national hybrids, appearing a demand for these genotypes evaluation for their agronomic potential. Papaya hybrids have higher yields than the cultivars (LUZ et al 2015). A crossing between a Solo group originator (Sunrise Solo) and a Formosa group originator (JS12) generated the hybrid UENF/Caliman 01 and it shows superior morpho-agronomic characteristics. Plants generated from the planting of hybrids F1 seeds (at maximum heterosis) show ideal morphophysiological characteristics while the planting of F2 seeds can generate plants that show segregation and heterogeneity in the orchard, which compromises the quality of crops (ANDRADE; PEREIRA, 2005; MARIN et al, 2006 a, b). The evaluation of hybrid genotypes at maximum heterosis and their segregating generations become important
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
