Initial and final fruit set in some plum (Prunus domestica L.) hybrids under different pollination types

The paper presents results of two-year study (2009-2010) of initial and final fruit set in promising plum (Prunus domestica L.) hybrids developed at Fruit Research Institute - Cacak, under different pollination conditions. The following hybrids were studied: 38/62/70 (?Hall? x ?California Blue?), 32/21/87 (?Stanley? x ?Scoldus?), IV/63/81 (?Large Sugar Prune? x ?Scoldus?), 22/17/87 (?Cacanska Najbolja? x ?Zh'lta Butilcovidna?), 29/29/87 (?Stanley? x ?Scoldus?) and 34/41/87 (?Valjevka? x ?Cacanska Lepotica?). Each of the hybrids was studied both under self- pollination and open pollination. In vitro pollen germination was also performed as well as characteristics of flowering phenophase and flowering abundance. Generally, the results suggest lower flowering abundance in the second year of the study. Pollen germination ranged from averagely 25.31% (29/29/87) to 40.01% (38/62/70). With averagely 31.59% final fruit set under self-pollination and 29.38% under open pollination variants, respectively, hybrid 34/41/87 gave the best results. The lowest performance was observed in hybrid 32/21/87 with 1.61% and 7.69% final fruit set under self- and open pollination variants, respectively.

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The effect of pollenizer on the fruit set of plum cultivar Cacanska Najbolja

Journal of Agricultural Sciences Belgrade ◽

10.2298/jas1201009n ◽

2012 ◽

Vol 57 (1) ◽

pp. 9-18 ◽

Cited By ~ 3

Author(s):

Dragan Nikolic ◽

Vera Rakonjac ◽

Milica Fotiric-Aksic

Keyword(s):

Pollen Germination ◽

Fruit Set ◽

Open Pollination ◽

In Vitro Pollen Germination ◽

Controlled Pollination ◽

Very High

In this paper, during a 4-year period (2003-2006) effects of six pollenizers (President, Italian Prune, Stanley, Cacanska Rodna, Agen 707, and California Blue) on the degree of fruit set in the plum cultivar Cacanska Najbolja were examined. Besides the controlled pollination of this cultivar, open pollination was investigated. Functional pollen ability in pollenizer-cultivars was established by in vitro pollen germination. Degree of fruit set was determined comparing the number of fruit set (10 days after pollination, 21 days after pollination and number of harvested fruits) against the number of pollinated flowers. The results indicated that all pollenizer cultivars, studied in this paper, possessed satisfactory in vitro pollen germination (30.1-67.4%). The number of fruit set determined 10 days after pollination was very high and did not differ among pollenizers. Highly significant differences were found between the pollenizers in the number of fruit set 21 days after pollination and significant ones in relation to the number of harvested fruits. Compared to open pollination, higher number of fruit set 21 days after pollination and higher number of harvested fruits were obtained when cultivars Stanley (17.0%; 7.6%) and Italian Prune (14.6%; 6.9%) were used as pollenizers, therefore those cultivars are recommendable as good pollenizers for the cultivar Cacanska Najbolja.

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Olive Fertility as Affected by Cross-Pollination and Boron

The Scientific World JOURNAL ◽

10.1100/2012/375631 ◽

2012 ◽

Vol 2012 ◽

pp. 1-8 ◽

Cited By ~ 18

Author(s):

A. Spinardi ◽

D. Bassi

Keyword(s):

Pollen Germination ◽

Fruit Set ◽

Optimal Level ◽

Lake Area ◽

Open Pollination ◽

Cross Pollination ◽

Self Pollination ◽

Self Compatibility ◽

Source Sink

Self-compatibility of local olive (Olea europaeaL.) accessions and of the cultivars “Frantoio” and “Leccino” was investigated in Garda Lake area, northern Italy. Intercompatibility was determined for “Casaliva,” “Frantoio,” and “Leccino,” as well as the effects of foliar Boron applications (0, 262, 525, or 1050 mg·L−1) applied about one week before anthesis on fruit set, shotberry set, and onin vitropollen germination. Following self-pollination, fruit set was significantly lower and the occurrence of shot berries significantly higher than those obtained by open pollination. No significant effect of controlled cross-pollination over self-pollination on fruit set and shotberry set was detectable. B treatments increased significantly fruit set in “Frantoio” and “Casaliva” but not in “Leccino.” B sprays had no effect on shotberry set, suggesting that these parthenocarpic fruits did not strongly compete for resources allocation and did not take advantage of increased B tissue levels. Foliar B application enhancedin vitropollen germination, and the optimal level was higher for pollen germination than for fruit set. Our results highlight the importance of olive cross pollination for obtaining satisfactory fruit set and the beneficial effect of B treatments immediately prior to anthesis, possibly by affecting positively the fertilisation process and subsequent plant source-sink relations linked to fruitlet retention.

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Vitality and in vitro pollen germination of different ‘Oblacinska’ sour cherry clones

Genetika ◽

10.2298/gensr1703791a ◽

2017 ◽

Vol 49 (3) ◽

pp. 791-800

Author(s):

Milica Fotiric-Aksic ◽

Radosav Cerovic ◽

Vera Rakonjac ◽

Ivana Bakic ◽

Slavica Colic ◽

...

Keyword(s):

Pollen Tube ◽

Pollen Tube Growth ◽

Pollen Germination ◽

Fruit Set ◽

Sour Cherry ◽

Tube Growth ◽

Tube Length ◽

In Vitro Pollen Germination ◽

Pollen Tube Length

Vitality of pollen, in vitro pollen germination and pollen tube growth (pollen tube length and pollen tube growth rate) were investigated in Oblacinska sour cherry in order to determine the differences between clones which have divergent yielding potential. For this purpose two ?Oblacinska? sour cherry clones with high fruit set and high yields (II/2, III/9) and two with low fruit set and low-yielding (XI/3 and XIII/1) were used in this study. Pollen germination was done on artificial medium containing 14% sucrose and 0.3% agar-agar at room temperature (23?C). Pollen tube growth was stopped with a drop of 40% formaldehyde, 1, 3, 6, 12 and 24 h after contact with the medium. The maximum percentage of germination ranged from 13.01% (clone II/2, after 1 h) to 54.19% (clone III/9, after 24 h). Pollen tube length varied from 64.84 ?m (clone XIII/1, after 1 h) to >1,100 ?m (clones II/2 and III/9, after 24 h). Pollen growth rate was quite high (up to 1.71 ?m min-1) after 6 h of germination, but rather decreasing until 24 h of germination (0.56-0.83 ?m min-1). The dynamics of in vitro pollen tubes growth among the clones were quite different, especially after 12 h and 24 h of germination. Clones that are singled out as fruitful (II/2 and III/9) gave much better results regarding pollen germination and pollen tube growth in comparison to clones which were characterized by low fruit set and yields (XI/3 and XIII/1).

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THE ROLE OF BORON IN FLOWERING AND FRUIT SET

HortScience ◽

10.21273/hortsci.25.9.1161b ◽

1990 ◽

Vol 25 (9) ◽

pp. 1161b-1161

Author(s):

Patrick H. Brown ◽

Louise Ferguson ◽

Geno Picchioni

Keyword(s):

Pollen Germination ◽

Fruit Set ◽

Flower Buds ◽

In Vitro Pollen Germination ◽

Icp Ms ◽

In Vitro Measurements ◽

Uptake Studies

The uptake and distribution of foliar and soil applied boron has been followed in a seven year old pistachio orchard by utilizing 10B isotope dilution techniques and ICP-MS determination. In conjunction with these uptake studies, in-vivo and in-vitro measurements of pollination and fruit set have been used to determine the role of boron in flowering and fruit set.Foliar applications of boron (1, 2.5 and 5 kg/400 l) resulted in improved fruit set when compared to control trees receiving no supplemental B even when tissue B levels in these control trees appeared adequate (>60 μg/g dwt). Results indicate that B applied to male trees in the late dormant phase (february) is effective in enhancing in-vitro pollen germination by as much as 50%. Movement of B into flower buds and fruit clusters was verified using 10B techniques thus demonstrating the potential usefulness of this technique in correcting incipient B deficiency. A possible role of B in the flowering and fruiting process is discussed.

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Fungicidal Inhibition of Pollen Germination and Germ-tube Elongation in Muskmelon

HortScience ◽

10.21273/hortsci.26.5.529 ◽

1991 ◽

Vol 26 (5) ◽

pp. 529-530 ◽

Cited By ~ 2

Author(s):

John D. Abbott ◽

B.D. Bruton ◽

C.L. Patterson

Keyword(s):

Cucumis Melo ◽

Pollen Germination ◽

Germ Tube ◽

Fruit Set ◽

Commercial Production ◽

In Vitro Pollen Germination ◽

Cupric Hydroxide ◽

Germ Tube Elongation

Four fungicides were evaluated for their effects on in vitro pollen germination of muskmelon (Cucumis melo L.) cultivars TAM-Uvalde and Magnum 45. Cupric hydroxide, mancozeb, and chlorothalonil reduced the percentage of pollen that germinated and rate and length of germ-tube elongation, regardless of cultivar. Benomyl had very little overall effect on pollen germination or germ-tube elongation. With the effective pollination period of ≈ 10 to 14 days in commercial production, each day is critical for maximum crown set. Based on our results. some fungicides may be contributing to reduced fruit set in muskmelon.

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