scholarly journals Metrical Analysis of a Putative Source for Semi-seedlessness in Rabbiteye Blueberry, Vaccinium ashei Reade.

HortScience ◽  
1996 ◽  
Vol 31 (2) ◽  
pp. 272-274 ◽  
Author(s):  
M.K. Ehlenfeldt ◽  
M.R. Hall
Keyword(s):  
Embryo Abortion ◽  
Vaccinium Ashei ◽  
Cross Pollination ◽  
Seedless Fruit ◽  
Metrical Analysis

T 286, a rabbiteye blueberry selection from a `Delite' × `Tifblue' cross, generally has been regarded as producing semi-seedless fruit. A comparison of nonpollinated flowers of T 286, `Delite', and `Tifblue' showed no differences in ovule count, and comparisons of ovules at 10, 20, and 40 days from manual cross-pollination showed no obvious evidence of embryo abortion. Manually cross-pollinated flowers contained 85, 60, and 38 seeds per fruit for `Delite', `Tifblue', and T 286, respectively. Open-pollinated fruit of T 286 had a seed count similar to that of open-pollinated `Tifblue' but possessed significantly heavier fruit. The number of seed in T 286 and `Tifblue' indicates a tendency toward parthenocarpy.

scholarly journals A Novel Method to Quantify Transport of Self- and Cross-pollen by Bees in Blueberry Plantings

HortScience ◽  
2005 ◽  
Vol 40 (7) ◽  
pp. 2002-2006 ◽  
Author(s):  
Patricio A. Brevis ◽  
D. Scott NeSmith ◽  
Lynne Seymour ◽  
Dorothy B. Hausman
Keyword(s):  
Pollen Dispersal ◽  
Consistent Difference ◽  
Vaccinium Ashei ◽  
Frequency Distributions ◽  
Cross Pollination ◽  
Berry Size ◽  
Pollen Mixture ◽  
Novel Method ◽  
Ripening Rate ◽  
Pollen Diameter

Blueberry species (Vaccinium section Cyanococcus) benefit from cross-pollination. Outcrossing increases fruit set, berry size, and ripening rate. Although knowledge of pollen dispersal is essential for maximizing cross-pollination and achieving optimal planting designs, this process has not been quantified previously in blueberry plantings. A novel method was developed to estimate the proportion of self- and cross-pollen transported by blueberry pollinators. The proposed technique requires a consistent difference in pollen size between two cultivars to predict the composition of a pollen mixture based on frequency distributions of pollen diameter. Vaccinium ashei Reade `Brightwell' and `Climax' were chosen for this study because they produce pollen tetrads of different size. Tetrad diameter and number were analyzed with a particle counter. The technique was validated by predicting the proportion of `Brightwell' in pollen mixtures where the cultivar composition was known, and predicted and actual values were linearly correlated (r = 0.995, P < 0.0001). The technique was then applied to pollen samples extracted from the bodies of pollinators that were collected in a mixed `Brightwell' and `Climax' blueberry plot. Numbers of blueberry tetrads extracted per bumblebee (Bombus spp.) averaged 4595 and 797 in 2003 and 2004, respectively, which was considered adequate to make accurate predictions based on frequency distributions of tetrad diameter. The proportion of `Brightwell' pollen carried by bumblebees changed with the phenology of the crop following an expected pattern, indicating that the method performed well under field conditions. This technique could potentially be used to quantify the likelihood for outcrossing and establish the effect of cultivar arrangements on pollen dispersion, as well as to examine pollen collection and manipulation, and cultivar preference by bees.

scholarly journals Transport of Cross-pollen by Bumblebees in a Rabbiteye Blueberry Planting

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1127B-1127
Author(s):  
Patricio A. Brevis ◽  
D. Scott NeSmith
Keyword(s):  
Fruit Set ◽  
Pollen Grains ◽  
Pollen Load ◽  
Vaccinium Ashei ◽  
Pollen Loads ◽  
Cross Pollination ◽  
Limited Degree ◽  
Novel Method ◽  
Pollen Release ◽  
Pollen Diameter

Blueberries are bee-pollinated species that benefit from cross-pollination. Cross-pollination is particularly critical for optimum fruit set of rabbiteye blueberries (Vaccinium ashei Reade) because of their limited degree of self-fertility. In order to determine if the failure to set adequate commercial fruit loads is due to a lack of cross-pollination, research was needed to establish how much out-crossing rabbiteye blueberry pollinators actually do. A novel method was developed to identify pollen grains on the bodies of bumblebees by cultivar. The technique discriminates between two cultivars, based on differences in pollen diameter. Bumblebees were collected in a plot composed of blueberry plants of the cultivars Brightwell and Climax since these cultivars produce pollen of different size. Pollen loads of bumblebees contained low proportions of cross-pollen regardless of the cultivar they were visiting. Data suggest that inadequate levels of cross-pollination play a major role in low fruit set problems of rabbiteye blueberry. The composition of bees' pollen load changed with the phenology of the crop. The greatest likelihood for cross-pollination occurred around the time of maximum bloom overlap. Bumblebees foraging on `Brightwell' flowers carried more total blueberry pollen and a higher proportion of self-pollen than those visiting `Climax'. This may be due to differences in pollen release between flowers of these two cultivars.

scholarly journals Pollination Study of Mandarins and the Effect on Seediness and Fruit Size: Implications for Seedless Mandarin Production

HortScience ◽  
2005 ◽  
Vol 40 (2) ◽  
pp. 362-365 ◽  
Author(s):  
Chih-Cheng T. Chao
Keyword(s):  
Fruit Set ◽  
Fruit Size ◽  
Reciprocal Crosses ◽  
Cross Pollination ◽  
Seedless Fruit ◽  
Very High

A pollination study was conducted using `Nules', `Fina Sodea', `Marisol', `Fina' Clementine, `Afourer', `Tahoe Gold', and `Gold Nugget' mandarin. The fruit sets from selfing of `Fina', `Marisol', `Fina Sodea', `Nules' Clementines and `Afourer' mandarin were very low or near 0. The open pollinated Clementines had very low fruit set and there were very few seeds per fruit. Fruit set was highest (20% to 40%) in cross-pollination between two Clementines, `Nules' and `Fina Sodea', and `Afourer' mandarin and their reciprocal crosses. There were averaged 23 to 32 seeds per fruit in Clementines × `Afourer' mandarin crosses and averaged 5 to 12 seeds per fruit in `Afourer' mandarin × Clementines crosses. Compatibility among Clementine mandarins and `Afourer' mandarin is very high and caution should be taken to properly isolate these two types of mandarins when planting to produce seedless fruit. The diploid `Nules' Clementine × triploid `Tahoe Gold' mandarin gave 14% and 17% fruit sets in 2002 and 2003, with an average 2 seeds and 9 seeds per fruit in 2002 and 2003, respectively. Caution should also be taken when planting triploid seedless `Tahoe Gold' mandarin near diploid `Nules' Clementine to avoid seeds. The compatibilities and seediness between diploid mandarin cultivars and new seedless triploid mandarin cultivars need to be tested to ensure the pollen of the new triploid cultivars will not cause seeds in the existing diploid cultivars.

scholarly journals Study On The Cross Compatibility Of Some Lemon Genotypes (Citrus Limon L.)

1970 ◽  
Vol 36 (2) ◽  
pp. 241-246 ◽  
Author(s):  
MI Hossain ◽  
MG Rabbani
Keyword(s):  
The Self ◽  
Lower Percentage ◽  
Citrus Limon ◽  
Self Incompatibility ◽  
Seed Setting ◽  
Cross Pollination ◽  
Seedless Fruit ◽  
Cross Compatibility ◽  
Fruit Setting ◽  
The Cross

An investigation was carried out at the Department of Horticulture, Bangladesh Agricultural University, Mymensingh to examine compatible relationship among the available lemon genotypes. Seven selected genotypes of lemon were used for hybridization. Crossings were performed following diallel fashion. The results revealed that the lower percentage of fruit setting as well as seed setting in some cross combinations noticed the existence of incompatibility among the selected genotypes. The percentages of fruit setting and seed setting were higher in the cross-pollination than in the self- pollination, which was an indication of self-incompatibility. To achieve seedless fruit setting, self-incompatibility may be used successfully. Keywords: Cross compatibility; lemon genotypes. DOI: http://dx.doi.org/10.3329/bjar.v36i2.9250 BJAR 2011; 36(2): 241-246

INFLUENCE OF CROSS-POLLINATION ON THE DEVELOPMENT OF PARTHENOCARPIC OLIVE (OLEA EUROPAEA) FRUITS (SHOTBERRIES)

2009 ◽  
Vol 46 (1) ◽  
pp. 67-76 ◽  
Author(s):  
GEORGIOS C. KOUBOURIS ◽  
IOANNIS T. METZIDAKIS ◽  
MILTIADIS D. VASILAKAKIS
Keyword(s):  
Air Temperature ◽  
Olive Tree ◽  
Flowering Period ◽  
Cross Pollination ◽  
Seedless Fruit ◽  
Controlled Crosses ◽  
The Impact ◽  
To Receive ◽  
Fruit Formation ◽  
Effective Pollinator

SUMMARYThe impact of three different pollination treatments (self-, cross-, free-) on the degree of shotberry (seedless fruit) formation of the olive tree cultivars (cvs) Koroneiki, Kalamata, Mastoidis and Amigdalolia was studied for three consecutive years. Controlled crosses were made for the cross-pollination treatments, while for the free pollination treatment flowers were allowed to receive pollen from more than 40 cultivars present in the field. Significant differences were recorded between treatments, cultivars and years. The lowest degree of shotberry formation was observed in free-pollinated trees while the highest was in self-pollinated trees of all cultivars. Low air temperature incidents during the flowering period increased shotberry formation. Cultivars Koroneiki and Mastoidis were reciprocally the most effective pollinator varieties in reducing shotberries. Cultivar Koroneiki could be considered as the most suitable pollinator to reduce shotberries in Kalamata. When cv. Amigdalolia was cross-pollinated by cvs Koroneiki and Mastoidis the degree of shotberry formation was lower when compared to cross-pollination by cv. Kalamata.

scholarly journals Transport of Cross-pollen by Bumblebees in a Rabbiteye Blueberry Planting

HortScience ◽  
2005 ◽  
Vol 40 (7) ◽  
pp. 2007-2010 ◽  
Author(s):  
Patricio A. Brevis ◽  
D. Scott NeSmith
Keyword(s):  
Fruit Set ◽  
Vaccinium Ashei ◽  
Particle Counter ◽  
Frequency Distributions ◽  
Fruit Crop ◽  
Cross Pollination ◽  
Flowering Season ◽  
Small Fruit ◽  
Median Proportion ◽  
Pollen Diameter

Rabbiteye blueberry (Vaccinium ashei Reade) is a bee-pollinated small fruit crop that often exhibits poor fruit set. Mixed cultivar plantings are recommended because cross-pollination is required for optimum yields, and bees are expected to transfer pollen from one cultivar to another. The objective of this study was to assess transport of cross-pollen by bumblebees in a rabbiteye blueberry planting. Experiments were conducted in 2003 and 2004 in a plot composed of `Brightwell' and `Climax' plants arranged in alternating rows. The proportion of `Brightwell' and `Climax' pollen carried on the bodies of bumblebees was estimated based on frequency distributions of pollen diameter, measured with a particle counter. About 75% of bumblebees collected in 2003 carried <20% cross-pollen. Proportions of cross-pollen in 2004 were higher than in 2003, but still, about 85% of bumblebees collected carried <40% cross-pollen. The proportion of cross-pollen carried by bumblebees changed during the flowering season. The greatest likelihood for cross-pollination occurred during the time of maximum bloom overlap, although the median proportion of cross-pollen was not >30% on any sampling day of 2004. The results from this study emphasize the need to select more self-fertile rabbiteye blueberry cultivars and to maximize bloom overlap in blueberry plantings.

A Leaf Bud Development Scale for Rabbiteye Blueberry

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 455f-456 ◽  
Author(s):  
D. Scott NeSmith ◽  
Gerard Krewer ◽  
Jeffrey G. Williamson
Keyword(s):  
Reproductive Development ◽  
Developmental Differences ◽  
Research Management ◽  
Growth Stages ◽  
Vaccinium Ashei ◽  
Bud Development ◽  
Dormant Bud ◽  
Mouse Ear ◽  
Highbush Blueberries ◽  
Winter Chilling

Crop vegetative and reproductive development are frequently divided into stages to describe progression of development. Such a description is useful in denoting developmental differences between cultivars, for making crop management decisions based on growth stages, and for clear communication among individuals concerned with research, management, and production of the crop. We have developed such a scale for leaf bud development in rabbiteye blueberry (Vaccinium ashei Reade). Our scale has six stages briefly described as follows: 1) dormant bud; 2) early green tip; 3) late green tip; 4) unfolding stage; 5) mouse-ear stage; 6) fully opened bud. Categorizing buds in this manner has proven useful in comparing rates of leaf development between cultivars and in response to winter chilling. The stages appear to be relevant to highbush blueberries (V. corymbosum) as well.

Sign in / Sign up

Export Citation Format

Share Document