Abstract
Parthenocarpic fruit development (PFD) reduces fruit yield and quality in grapevine. Parthenocarpic seedless berries arise from fruit set without effective fertilization due to defective pollen germination. PFD has been associated to micronutrient deficiency but the relation of this phenomenon with pollen polymorphism has not been reported before. In this work, six grapevine cultivars with different tendency for PFD and grown under micronutrient-sufficient conditions were analyzed to determine pollen structure and germination capability as well as PFD rates. Wide variation in non-germinative abnormal pollen was detected either among cultivars as well as for the same cultivar in different growing seasons. A straight correlation with PFD rates was found (R2 = 0.9896), suggesting that natural parthenocarpy is related to defective pollen development. Such relation was not observed when PFD was analyzed in grapevine plants exposed to exogenous gibberellin (GA) or abscissic acid (ABA) applications at pre-anthesis. Increase (GA treatment) or reduction (ABA treatment) in PFD rates without significative changes in abnormal pollen was determined. Although these plants were maintained at sufficient boron (B) condition, a down-regulation of the floral genes VvBOR3 and VvBOR4 together with a reduction of floral B content in GA-treated plants was established. These results suggest that impairment in B mobility to reproductive tissues and restriction of pollen tube growth could be involved in the GA-induced parthenocarpy.
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Claims 14
Claim · model-written summary
Abnormal non-germinative pollen varied among grapevine cultivars.
- Organ / stage
- pollene0
- Outcome
- variation in non-germinative abnormal pollene0
- Qualifier
- among cultivarse0
VitisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wide variation in non-germinative abnormal pollen was detected either among cultivars as well as for the same cultivar in different growing seasons.”
t0“Grapevine”
Claim · model-written summary
Abnormal non-germinative pollen varied across growing seasons within cultivars.
- Organ / stage
- pollene0
- Outcome
- variation in non-germinative abnormal pollene0
- Qualifier
- different growing seasonse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wide variation in non-germinative abnormal pollen was detected either among cultivars as well as for the same cultivar in different growing seasons.”
t0“Grapevine”
Claim · model-written summary
Abnormal pollen was strongly correlated with natural PFD rates (R2 = 0.9896).
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A straight correlation with PFD rates was found (R2 = 0.9896), suggesting that natural parthenocarpy is related to defective pollen development.”
t0“Pollen Morphology and Boron Concentration in Floral Tissues as Factors Triggering Natural and GA-Induced Parthenocarpic Fruit Development in Grapevine”
Claim · model-written summary
Pollen abnormality and PFD were not related under gibberellin (GA) treatment.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such relation was not observed when PFD was analyzed in grapevine plants exposed to exogenous gibberellin (GA) or abscissic acid (ABA) applications at pre-anthesis.”
Claim · model-written summary
Pollen abnormality and PFD were not related under abscissic acid (ABA) treatment.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such relation was not observed when PFD was analyzed in grapevine plants exposed to exogenous gibberellin (GA) or abscissic acid (ABA) applications at pre-anthesis.”
Claim · model-written summary
GA treatment increased PFD rates.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase (GA treatment) or reduction (ABA treatment) in PFD rates without significative changes in abnormal pollen was determined.”
t0“Grapevine”
Claim · model-written summary
ABA treatment reductiond PFD rates.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase (GA treatment) or reduction (ABA treatment) in PFD rates without significative changes in abnormal pollen was determined.”
t0“Grapevine”
Claim · model-written summary
GA treatment caused no significant change in abnormal pollen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase (GA treatment) or reduction (ABA treatment) in PFD rates without significative changes in abnormal pollen was determined.”
t0“Grapevine”
Claim · model-written summary
ABA treatment caused no significant change in abnormal pollen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase (GA treatment) or reduction (ABA treatment) in PFD rates without significative changes in abnormal pollen was determined.”
t0“Grapevine”
Claim · model-written summary
VvBOR3 was downregulated in GA treated grapevine.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although these plants were maintained at sufficient boron (B) condition, a down-regulation of the floral genes VvBOR3 and VvBOR4 together with a reduction of floral B content in GA-treated plants was established.”
t0“Grapevine”
Claim · model-written summary
VvBOR4 was downregulated in GA treated grapevine.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although these plants were maintained at sufficient boron (B) condition, a down-regulation of the floral genes VvBOR3 and VvBOR4 together with a reduction of floral B content in GA-treated plants was established.”
t0“Grapevine”
Claim · model-written summary
Floral boron content was reduced in GA treated plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although these plants were maintained at sufficient boron (B) condition, a down-regulation of the floral genes VvBOR3 and VvBOR4 together with a reduction of floral B content in GA-treated plants was established.”
t0“Grapevine”
Claim · model-written summary
impairment in B mobility to reproductive tissues may contribute to GA induced parthenocarpy.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that impairment in B mobility to reproductive tissues and restriction of pollen tube growth could be involved in the GA-induced parthenocarpy.”
t0“Grapevine”
Claim · model-written summary
restriction of pollen tube growth may contribute to GA induced parthenocarpy.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that impairment in B mobility to reproductive tissues and restriction of pollen tube growth could be involved in the GA-induced parthenocarpy.”
t0“Grapevine”
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