Effects of accelerated pollen-cone development on pollen cytology and fertilizing potential in western hemlock (Tsuga heterophylla)

Colangeli, Anna M.; Owens, John N.

doi:10.1016/0378-1127(91)90035-t

Cited by 8 publications

(9 citation statements)

References 11 publications

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“…Forcing pollen cones in Sitka spruce caused abnormal pollen development similar to that described for T. heterophylla (Colangeli & Owens, 1990). Forcing before or during meiosis in Sitka spruce did not visually affect meiosis other than perhaps making it less synchronous within a microsporangium though it may cause biochemical damage which is not manifest until later.…”

Section: Discussionmentioning

confidence: 56%

“…Colangeli and Owens (1990) demonstrated that in T. heterophylla early forcing lowered pollen and seed yield but forcing after the free microspore stage was less detrimental. The present study differs in that PMC meiosis was not adversely affected and abnormalities occurred in later stages of development.…”

Section: Discussionmentioning

confidence: 99%

“…Eriksson et al (1970) observed meiotic irregularities in P. abies (L.) Karst grafts forced in a polythene house and other studies have also indicated that certain stages of microsporogenesis, especially meiosis, are sensitive to high temperatures (Sarvas, 1972;Jonsson, 1974;Luomajoki, 1977). Colangeli & Owens (1990), using cut branches of Tsuga heterophylla (Raf.) Sarg., forced pollen at various stages of pollen-cone development.…”

Section: Introductionmentioning

confidence: 91%

“…Several studies have been made on forcing pollen using attached bagged branches (Boyer & Woods, 1973;Beers, Bivens & Mocha, 1981), cut branches placed in water (Winton, 1964;Jonsson, 1974;Dorman, 1976;Beers et al, 1981;ColangeH & Owens, 1990) or potted trees placed in greenhouses or growth chambers (Eriksson, Ekberg & Jonsson, 1970;Ross, 1988;Colangeli & Owens, 1990). Ross (1988) reported a high percentage of underdeveloped and rotted pollen cones and decreased pollen yield per cone when potted grafts of Picea engelmannii (Perry) were forced in a polythene house.…”

Section: Introductionmentioning

confidence: 99%

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Production and development of seed and pollen in grafts of Picea sitchensis (Bong.) Carr. treated with gibberellin A4/7 to induce coning and the effect of forcing treatments

1990

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SUMMARYConing was induced on container-grown grafts of Picea sitchensis (Bong.) Carr. by stem injection of gibberellin A4/7 in combination with heat and drought in a polythene house. After overwintering outdoors pollen and seed development in the following year were studied. Control grafts remained outdoors, except for a 16 d period (late April-early May) in the polythene house to facilitate pollen shedding and pollinations. Pollen was at the 2-to 3-cell stage when these grafts were placed in the polythene house and the grafts produced good quantities of high quality pollen and seed which could be used in tree improvement programmes. Placing grafts in warm conditions in January or March, when pollen was predominantly at a pre-meiotic stage, advanced cone-bud development but reduced the yield of pollen and seed, though forcing in March was less detrimental. Cytological study showed no meiotic irregularities in pollen mother cells forced in January or March, but abnormalities in later stages of pollen development included failure of tetrads to separate, retardation of development and degeneration of immature pollen. Poor seed development in January-forced cones may be attributed to retarded development of the distal portion of the cones. Nucelli in the distal ovules had not become secretory at pollination and hence little or no pollen was taken into the micropyle, also there was retarded development of the megagametophyte which could adversely affect fertilization. More proximal ovules of forced cones, and ovules of control cones, had well developed nucelli which were actively secreting pollination droplets, pollen was commonly found in the micropyle and the megagametophyte was developing normally.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Production and development of seed and pollen in grafts of Picea sitchensis (Bong.) Carr. treated with gibberellin A4/7 to induce coning and the effect of forcing treatments

1990

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“…It is also possible to force male cone maturation in coniferous species by increasing daylength, light intensity and relative humidity (Worksley 1959) . However, Colangeli and Owens (1991) suggest that these treatments are ineffective because they reduce the number of mature male cones, decrease the amount of pollen produced, increase the number of abnormally developed pollen and reduce the pollen's fertility potential . In fact, satisfactory results were only obtained when the branches were placed in a growth chamber when at least 50% of male bud scales had emerged .…”

Section: Introductionmentioning

confidence: 99%

In situ forcing of pollen maturation in Jack pine and Japanese larch male cones

Mercier

1995

New Forest

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Application . The period between pollen dispersal and female cone receptivity in conifer trees is very short . This constitutes an obstacle to pollination control in work done by geneticists and seed-orchard managers . However, it is possible to accelerate the male cone maturation with a localized greenhouse effect around the bud-bearing branches, produced by enveloping the male cones with paper or plastic bags .Abstract . Paper bags equipped with a polyethylene window were placed on branchlets 6 and 9 weeks before the time of pollen dispersal of Japanese larch and Jack pine, respectively . This technique produced a localized greenhouse effect around the branchlets, accelerating male cone development. For Jack pine trees, buds in bags with the window oriented upward had the shortest maturation time . In fact, it was possible to collect these pollen cones about 11 days before the unbagged control without decreasing the production of pollen . The mean germination rate of the pollen from the bags with the window pointed upward, however, was significantly lower than the control, by about 15% . Buds in bags with the window oriented downward had an accelerated development of about 9 days (compared to the control) but did not experience a decrease in pollen production or quality . This same technique caused the abortion of male cones of the Japanese larch trees . Thermal probes in the bags enabled us to follow the progression of temperature inside and outside the bags during the development of the male cone in each species . They revealed that the bags increased mean temperature, daily temperature range, and degree-day accumulation, and that this effect was most pronounced for Jack pine, when the polyethylene window was oriented upward .

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Density Effect on the Fruit-set, Seed Crop Viability and Seedling Vigour ofAbies pinsapo

Arista

Lozano

1996

Annals of Botany

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Effects of accelerated pollen-cone development on pollen cytology and fertilizing potential in western hemlock (Tsuga heterophylla)

Cited by 8 publications

References 11 publications

Production and development of seed and pollen in grafts of Picea sitchensis (Bong.) Carr. treated with gibberellin A4/7 to induce coning and the effect of forcing treatments

Production and development of seed and pollen in grafts of Picea sitchensis (Bong.) Carr. treated with gibberellin A4/7 to induce coning and the effect of forcing treatments

In situ forcing of pollen maturation in Jack pine and Japanese larch male cones

Density Effect on the Fruit-set, Seed Crop Viability and Seedling Vigour ofAbies pinsapo

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