External Morphological Characteristics for Periods during Pecan Microspore and Pollen Differentiation

Yates, I.E.; Sparks, Darrell

doi:10.21273/jashs.117.1.190

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…The intine is often noticeably irregular in thickness and permeated by cytoplasmic channels. The stratification of the walnut cultivars' pollen wall is similar to those described for J. regia (Colzoni et al, 1990) and pecan (Yates and Sparks, 1992).…”

Section: Resultssupporting

confidence: 71%

Anther and Pollen Morphology and Anatomy in Walnut (Juglans regia L.)

Mert¹

2010

horts

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The morphology and ultrastructure of anthers and pollen grains were described for eight walnut (Juglans regia L.) cultivars (Şebin, Bilecik, Kaman I, Kaplan 86, Yalova 3, Pedro, Hartley, and Franquette) using light microscopy and scanning and transmission electron microscopy. Anther and pollen dimensions and pollen production capabilities were also determined. The mean number of stamens per staminate flower (14.90 to 20.03) and mean anther dimensions (1412.5 to 2553.5 μm in length and 849.0 to 1145.5 μm in width) differed significantly among the cultivars. The number of pollen grains per anther also varied significantly and ranged from 4720 to 9840 among the cultivars. The pollen grains of walnut plants are spherical in shape (nearly circular) and pantocolporate (with many colporate apertures on the exine). The pollen surface is microechinate with spiniferous projections. The germination pores are circular and nonbordered. Pollen grain length varied from 33.35 to 37.50 μm in the examined cultivars. The ultrastructure of the pollen walls was similar between walnut cultivars. The exine was comprised of nexine and sexine, which was thicker than the underlying nexine. The sexine appeared as a strong tectum that was traversed by thin channels and decorated with spinulose processes. The thicknesses of the various layers of the pollen wall were as follows: intine: 82.1 to 200 nm; exine: 793.1 to 1161.1 nm; and total wall: 954.4 to 1327.8 nm.

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Section: Resultssupporting

confidence: 71%

Anther and Pollen Morphology and Anatomy in Walnut (Juglans regia L.)

Mert¹

2010

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“…Morphological characteristics of viable pollen stored in liquid nitrogen for 11 years (Fig. 2 A and B) did not appear to differ from fresh pollen (Yates and Sparks, 1992) or from pollen stored in liquid nitrogen for ≈2 years (Yates and Sparks, 1989). Cytoplasmic contents were evenly distributed throughout the grain, extending to the outer circumference of the pollen grain wall in unfixed, intact pollen grains ( Fig.…”

Section: Resultsmentioning

confidence: 86%

“…The trees were randomly selected each year. For each collection year, pollen from all parent, and opaque bodies [storage sites of starch and lipids (Yates and Sparks, 1992)]. Bulges forming at the pores appeared intact (Fig.…”

Section: Methodsmentioning

confidence: 99%

Pecan Pollen Stored Over a Decade Retains Viability

Sparks¹,

Yates²

2002

HortSci

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In vitro germination of freshly collected pollen and pollen stored 1, 10, 11, 12, and 13 years in liquid nitrogen was examined for `Desirable' pecan [Carya illinoinensis (Wangenh.) C. Koch]. Viability of pollen stored in liquid nitrogen for 1, 10, 11, 12, and 13 years was not diminished in comparison to that of fresh pollen. Morphology of stored pollen grains and the germ tube was normal. Thus, liquid nitrogen may offer a means of haploid preservation of pecan.

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Floral organ growth and carbohydrate content during pollen development in Lilium

Clément

Burrus

Audran

1996

American J of Botany

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In order to understand floral sugar physiology, we correlated the growth of the organs with carbohydrate content in the flower of Lilium cv. “enchantment” during pollen development. In a previous work, we distinguished two phases in pollen ontogenesis: the anther growth phase, from the microspore mother cell until the vacuolated microspore, and the anther maturation phase, from the vacuolated microspore until anthesis. In the present work, we showed that during the growth phase, the anther underwent most of its size and dry weight growth, whereas the growth rate of nonanther organs was reduced. Anther and filament possessed the highest amounts of carbohydrates, which decreased progressively until the vacuolated microspore stage. During the maturation phase, sucrose and starch increased in all floral organs. Anther growth was completed at the Mi stage, whereas the nonanther organs began exponential growth. From these observations, we concluded that hierarchic nutritional correlations exist between the flower organs, in which the anther is the main actor: during the anther growth phase, the anther represents the highest sink strength floral organ, and mainly attracts assimilates through the filament. During the anther maturation phase, anther growth is achieved, its needs decrease, and assimilates are thus available for neighboring organs, which undergo intense growth until anthesis.

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External Morphological Characteristics for Periods during Pecan Microspore and Pollen Differentiation

Cited by 5 publications

References 12 publications

Anther and Pollen Morphology and Anatomy in Walnut (Juglans regia L.)

Anther and Pollen Morphology and Anatomy in Walnut (Juglans regia L.)

Pecan Pollen Stored Over a Decade Retains Viability

Floral organ growth and carbohydrate content during pollen development in Lilium

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