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An evaluation of flowering variables...

Ruple, Alisha L.

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An evaluation of flowering variables in primocane-fruiting blackberries.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	An evaluation of flowering variables in primocane-fruiting blackberries./
作者:	Ruple, Alisha L.
面頁冊數:	102 p.
附註:	Source: Masters Abstracts International, Volume: 48-01, page: 0247.
Contained By:	Masters Abstracts International48-01.
標題:	Agriculture, Horticulture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1470872
ISBN:	9781109349405

An evaluation of flowering variables in primocane-fruiting blackberries.
Ruple, Alisha L.

An evaluation of flowering variables in primocane-fruiting blackberries. - 102 p.

Source: Masters Abstracts International, Volume: 48-01, page: 0247.

Thesis (M.S.)--University of Arkansas, 2009.

Flower fertility and heat tolerance of pollen were evaluated in blackberry (Rubus subgenus Rubus Watson) genotypes at the University of Arkansas. The effects of cross- and self-pollination on flowering variables were tested on five primocane-fruiting (PF) genotypes ('Prime-Jim'RTM, APF-31, APF-45, APF-59, and APF-77), and three floricane-fruiting (FF) genotypes ('Navaho', 'Natchez', and 'Ouachita') grown in field conditions. Four pollination treatments were applied to floricane flowers undisturbed open-pollinated, emasculated selfed, emasculated and cross-pollinated with PF-source pollen, and emasculated and cross-pollinated with FF-source pollen. During primocane flowering, three pollination treatments (undisturbed open-pollinated, emasculated selfed, and emasculated cross-pollinated) were used to further test the fertility of the five PF genotypes. Flower set, drupelet set, berry weight, and days to maturity were measured. Significant differences between cross-pollination treatments and self-pollination were seldom noted, with more differences observed in 'Prime-Jim'RTM than any other genotype. The results indicate that fertility appears sufficient in all the genotypes evaluated and that the later-generation genotypes (APF types) show improvement in fertility over 'Prime-Jim'RTM.

ISBN: 9781109349405Subjects--Topical Terms:

1017832
Agriculture, Horticulture.

An evaluation of flowering variables in primocane-fruiting blackberries.
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502 $a Thesis (M.S.)--University of Arkansas, 2009.
520 $a Flower fertility and heat tolerance of pollen were evaluated in blackberry (Rubus subgenus Rubus Watson) genotypes at the University of Arkansas. The effects of cross- and self-pollination on flowering variables were tested on five primocane-fruiting (PF) genotypes ('Prime-Jim'RTM, APF-31, APF-45, APF-59, and APF-77), and three floricane-fruiting (FF) genotypes ('Navaho', 'Natchez', and 'Ouachita') grown in field conditions. Four pollination treatments were applied to floricane flowers undisturbed open-pollinated, emasculated selfed, emasculated and cross-pollinated with PF-source pollen, and emasculated and cross-pollinated with FF-source pollen. During primocane flowering, three pollination treatments (undisturbed open-pollinated, emasculated selfed, and emasculated cross-pollinated) were used to further test the fertility of the five PF genotypes. Flower set, drupelet set, berry weight, and days to maturity were measured. Significant differences between cross-pollination treatments and self-pollination were seldom noted, with more differences observed in 'Prime-Jim'RTM than any other genotype. The results indicate that fertility appears sufficient in all the genotypes evaluated and that the later-generation genotypes (APF types) show improvement in fertility over 'Prime-Jim'RTM.
520 $a Pollen quality (using both chemical viability testing and in vitro germination testing), stigma receptivity, pollen tube growth, and fruit set (measured by percent fruit set, average berry weight, and drupelet set rating) were evaluated to determine if any improvements could be noticed when comparing a selection of later-generation PF genotypes (APF-31, APF-45, APF-59, and APF-77) to 'Prime-Jim'RTM and 'Prime-Jan' RTM in a controlled environment. Results indicated that pollen quality was significantly higher in later-generation PF genotypes compared to 'Prime-Jim' RTM and 'Prime-Jan'RTM. Stigma receptivity was observed in all genotypes, indicating that a relationship between poor fruit set and stigma receptivity is unlikely. Inhibition of pollen tube growth due to self-pollination was not noted in any genotype. Significant differences were not noted between cross- and self-pollination for the variables measured concerning fruit set; there was also no significant effect of genotype on the three fruit set variables. Although pollen quality was better for the later-generation PF genotypes, it did not appear to provide an advantage in actual fruit set in this study.
520 $a Pollen from five PF genotypes (APF-31, APF-45, APF-59, APF-77, and 'Prime-Jim' RTM) was screened for heat tolerance using a new screening technique. Pollen was placed on germination media and incubated at three temperatures (23°C, 30°C, and 35°C) for 48 h. Media was then examined for germinated pollen grains. Significantly more pollen germinated for APF-31, APF-45, and APF-59 than 'Prime-Jim' at all three temperatures. However, pollen germination decreased significantly as temperature increased for all genotypes. This implies that higher pollen viability, and likely not improved heat tolerance, enhanced pollen germination for APF-31, APF-45, and APF-59.
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