Self-fruitfulness, defined as the capacity of a cultivar to set fruit under self-pollination, has long attracted the interest of pear researchers and growers, because it determines to what extent pollination can be a limiting factor for an
A study initiated in Spring 1995 examined the influence of gibberellic acid (GA3) application timing on the return fruitfulness of Thompson Seedless and Flame Seedless table grapes. Vines treated with GA3 at prebloom, bloom, or berry set were compared to vines treated at prebloom + bloom + berry set and nontreated vines. Application amounts for each cultivar and timing were based on commercial label recommendations. Nodes from each treatment were collected in mid-winter and dissected, and their viability and fruitfulness were recorded. Bud viability (shoots per bud) and fruitfulness (clusters per shoot) also were evaluated at budbreak in 1996. The results indicate that GA3 applications at prebloom and bloom are most detrimental to bud viability and cluster initiation in these cultivars.
.2% of the nut weight. It is a laterally fruitful cultivar made up of 100% lateral buds. In China, Persian walnut ( Juglans regia L.) is one of the most cultivated nut tree species because of the nuts’ value. At the end of 2021, China had 7,454,935 ha
To contribute to commercial classification, this work sought to evaluate correlations between fruit mass and other physical characteristics of blackberry fruit, indicating direct and indirect effects of morphology and physical characteristics on blackberry fruit mass. The variables evaluated were the total mass of the blackberry fruit along with its physical components: fruit length, greater transverse diameter, smaller transverse diameter, fruit area, fruit perimeter, and fruit volume. Results of our analyses show that an increase in fruit length, fruit perimeter, and fruit volume reflects an increase in the total mass of the blackberry fruit. Indirectly, greater values of fruit length, greater transverse diameter, and smaller transverse diameter reflect an increase in the perimeter and volume of the blackberry fruit, thus contributing to larger, more attractive fruit.
Path coefficient analysis has been widely used to understand production better and determine the relationships between fruit and their constituents. This study evaluated the correlations between mass and other physical characteristics, and contributes to selecting cape gooseberry fruit. The attributes assessed were the total mass of the cape gooseberry fruit (TM) (fruit mass with husk), fruit mass (FM) (fruit mass without husk), husk mass (HM), husk length (HL), the largest transverse husk diameter (LD), fruit diameter (FD), and color of the husk (CH). Using path analysis, it was possible to verify directly that, among the physical components of the study, TM and FD have a direct and positive influence on FM. Fruit mass had a direct and negative correlation with HM, indicating that fruit with the heaviest husk (and green color) have not yet reached full maturation, nor reached their greatest mass. This result suggests that TM is strongly indirectly influenced by the HL, husk diameter, HM, and FD.
Fruit set, fruit size, and seed production after hand pollination in a greenhouse were compared for southern highbush blueberry managed in two ways: a) 69 clones were allowed to go dormant and lose their leaves in the field before being dug and subjected to 1000 hours at 5 °C and b) 26 clones were kept growing in a greenhouse through fall and winter without leaf loss and without chilling, to induce flowering on plants that had mature leaves. On each plant in both management systems, some flowers were self-pollinated, some were cross-pollinated, and others had the styles removed before anthesis to prevent pollination. For >1000 flowers per pollination treatment on the deciduous plants, fruit set averaged 1% for no pollination, 46% for self-pollination, and 76% for cross-pollination. The corresponding values for the evergreen plants were 23%, 59%, and 81%. Parthenocarpic berries averaged 0.37 g/berry for deciduous plants and 1.01 g for evergreen plants. Both crossed and selfed berry weights averaged slightly higher for the evergreen plants than for the deciduous plants, but seed number per berry was much lower for the evergreen plants (12 seeds in crossed berries and four seeds in selfed berries) compared to deciduous plants (37 and 8). Southern highbush blueberry plants that flower without going dormant appear to have much higher parthenocarpic capabilities than those that flower after a dormant period.
Abstract
Differences in pistil abortion did not account for variation in fruiting among ‘Manzanillo’ (biennal bearing), ‘Rubra’ (regular cropping), and ‘Swan Hill’ (strong blooming but unfruitful) olives (Olea europaea L.). Competition among normal fruits in an inflorescence seems to be a main factor in regulating final crops. Parthenocarpic fruit of ’Manzanillo’ and ‘Swan Hill’ did not exhibit fruit competition. A high percentage of ovules in ‘Swan Hill’ contained poorly developed embryo sacs at anthesis and were not fertilized. Most of the few parthenocarpic fruit formed eventually shriveled and abscised.
together at 1300 hr ; ( F ) two stigmas separated with some nectar at 1500 hr ; ( G ) two separated stigmas with plenty of nectar at 1700 hr ; ( H ) stigma changing color and no nectar at 0600 hr the next morning. Self-pollination/self-fruitfulness
). In most cases, such a wide-angle branch tends to be more fruitful and is preferred to an upright branch with more vigorous vegetative growth. This beveled stub cut, often referred as a “Dutch cut” ( Ferree and Schupp, 2003 ) in recognition of the
shoots/m of canopy). These results suggest that high canopy density might impair bud fruitfulness in ‘Sunbelt’ but not ‘Concord’. Therefore, decreasing pruning severity by minimal pruning might have only limited potential to increase ‘Sunbelt’ yields in