Temperature and dates of male meiosis in trees

Luomajoki, Alpo

doi:10.1111/j.1601-5223.1982.tb00760.x

Cited by 9 publications

(12 citation statements)

References 16 publications

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“…collected between 1965 and 1967 and that collected between 1968 and 1973. The newer part of the material was collected as described earlier (LUOMAJOKI 1977(LUOMAJOKI , 1982. In short, 10-30 male buds were excised either from the crown part of each of the individual trees, or in all from a population of ten trees, daily 1-6 times a day, depending on air temperatures.…”

Section: Methodsmentioning

confidence: 99%

“…As described by LUOMAJOKI (1982), each set of data on individual meioses was transformed into a series of cumulative percentages. Each percentage indicates the fraction of the PMCs in a given stage or in a later (more developed) stage.…”

Section: Methodsmentioning

confidence: 99%

“…The fundamentals of statistical considerations in phenology were treated by SARVAS (1972) and by LUOMAJOKI (1977LUOMAJOKI ( , 1982. NORDBY and NORDBY (1976) came to be same basic conclusions.…”

Section: Some Notes On Statisticsmentioning

confidence: 97%

“…The author has previously studied the rate and proportionality of meioses (LUOMAJOKI 1977) and the details of the timing of individual male meioses (LUOMAJOKI 1982). Because only up to five meioses of each tree species were studied, few conclusions Fig.…”

Section: Seeking the Zero Pointmentioning

confidence: 99%

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The tetrad phase of microsporogenesis in trees with reference to the annual cycle

Luomajoki¹

2008

Hereditas

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LUOMAJOKI, A. 1984. The tetrad phase of microsporogenesis in trees with reference to the annual cycle. —Hereditas 101:179–197. Lund, Sweden. ISSN 0018–0661. The timing of the tetrad phase of microsporogenesis in eleven tree species growing in natural conditions in Finland was studied in dates and in period unit (p.u.) and degree‐day (d.d.) heat sums. The different methods were compared. Latitudinal variation and variation between successive years in generative development were also studied. The total lengths of tree meioses were evaluated and the duration of the tetrad phase wasmeasured. The zero point of the active period of trees was sought. The variation in northern marginal populations was evaluated. The synchrony of the PMCs and the surrounding somatic cells and various effects of temperature and climate are discussed. The earliest species (of genera Larix, Populus, Abies and Picea) move into the active period soon after p.u. heat sums start to accumulate. Pinus sylvestris has a larger safety margin against late frosts. The magnitudes of the heat sums at a given phase have no consistent correlation to the relative earliness or lateness of an individual year. Photoperiodism has no apparent effect on the inititation of meioses in the spring. Latitudinal differences in the lengths of early intervals of the generative cycle are small or negligible. The winter dormancy is the most important element of adaptation of trees to severe climates, provided that the active period is not too long. The adaptation of Scots pine to northern conditions primarily functions by shrinking the safety margin of the winter dormancy. The transition between the major elements of the annual cycle is probably gradual.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Some Notes On Statisticsmentioning

confidence: 97%

Section: Seeking the Zero Pointmentioning

confidence: 99%

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The tetrad phase of microsporogenesis in trees with reference to the annual cycle

Luomajoki¹

2008

Hereditas

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“…Because of the high temperature accumulation provided by the UP bags the male cones matured in a significantly shorter time period than the other two treatments . Other authors have also suggested that a relationship exists between an increase in temperature and the accelerated development of male cones Sarvas 1972 ;Jonsson 1974 ;Luomajoki 19771982and pollen maturation Boyer and Woods 1973boyer 1981 . However the germination percentage of the pollen under the UP treatment was always about 10-15 less than the control.…”

Section: Discussionmentioning

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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The Annual Phenological Cycle

Hänninen

2016

Boreal and Temperate Trees in a Changing Climate

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Temperature and dates of male meiosis in trees

Cited by 9 publications

References 16 publications

The tetrad phase of microsporogenesis in trees with reference to the annual cycle

The tetrad phase of microsporogenesis in trees with reference to the annual cycle

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

The Annual Phenological Cycle

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