Temperature-conditioned irregularities in pollen mother cells of Picea abies (L.) Karst

Andersson, Enar

doi:10.1111/j.1601-5223.1980.tb01675.x

Cited by 6 publications

(2 citation statements)

References 5 publications

(3 reference statements)

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“…In some cases, we detected aberrant pollen, possibly the result of odd meiotic processes that did not render the pollen inviable (Supplementary Figure S1 ). Aberrant meiosis has been reported in pinyon pines and other conifers as a result of extreme temperatures ( Chira, 1965 ; Andersson, 2009 ). In wheat, abnormal pollen development can be induced by high temperature stress; the pollen mother cells complete meiosis but do not undergo mitosis ( Saini et al, 1984 ), microspores do not have cytoplasm, and may remain immature.…”

Section: Discussionmentioning

confidence: 99%

Higher Temperature at Lower Elevation Sites Fails to Promote Acclimation or Adaptation to Heat Stress During Pollen Germination

et al. 2018

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High temperatures associated with climate change are expected to be detrimental for aspects of plant reproduction, such as pollen viability. We hypothesized that (1) higher peak temperatures predicted with climate change would have a minimal effect on pollen viability, while high temperatures during pollen germination would negatively affect pollen viability, (2) high temperatures during pollen dispersal would facilitate acclimation to high temperatures during pollen germination, and (3) pollen from populations at sites with warmer average temperatures would be better adapted to high temperature peaks. We tested these hypotheses in Pinus edulis, a species with demonstrated sensitivity to climate change, using populations along an elevational gradient. We tested for acclimation to high temperatures by measuring pollen viability during dispersal and germination stages in pollen subjected to 30, 35, and 40°C in a factorial design. We also characterized pollen phenology and measured pollen heat tolerance using trees from nine sites along a 200 m elevational gradient that varied 4°C in temperature. We demonstrated that this gradient is biologically meaningful by evaluating variation in vegetation composition and P. edulis performance. Male reproduction was negatively affected by high temperatures, with stronger effects during pollen germination than pollen dispersal. Populations along the elevational gradient varied in pollen phenology, vegetation composition, plant water stress, nutrient availability, and plant growth. In contrast to our hypothesis, pollen viability was highest in pinyons from mid-elevation sites rather than from lower elevation sites. We found no evidence of acclimation or adaptation of pollen to high temperatures. Maximal plant performance as measured by growth did not occur at the same elevation as maximal pollen viability. These results indicate that periods of high temperature negatively affected sexual reproduction, such that even high pollen production may not result in successful fertilization due to low germination. Acquired thermotolerance might not limit these impacts, but pinyon could avoid heat stress by phenological adjustment of pollen development. Higher pollen viability at the core of the distribution could be explained by an optimal combination of biotic and abiotic environmental factors. The disconnect between measures of growth and pollen production suggests that vigor metrics may not accurately estimate reproduction.

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Section: Discussionmentioning

confidence: 99%

Higher Temperature at Lower Elevation Sites Fails to Promote Acclimation or Adaptation to Heat Stress During Pollen Germination

et al. 2018

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“…As such, cell disturbances and an increasing number of meiotic irregularities occur in these trees compared to local trees. The sensitivity of meiosis to extreme air temperatures is known to vary among the different stages of meiosis (Eriksson 1968;Andersson 1980). The stages from diakinesis to anaphase I and from metaphase II to telophase II appeared to be the most sensitive.…”

Section: Discussionmentioning

confidence: 98%

Specific features of meiosis in the Siberian Fir (Abies sibirica) in the forest Arboretum of the V. N. Sukachev Institute, Russia

2010

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Investigating the tolerance of plant reproductive systems to environmental changes has become a research priority under current climate change scenarios. Successful plant conservation requires knowledge of plant reproductive biology, particularly the meiotic characteristics of planted species. Meiosis, as part of microsporogenesis, is a critical plant developmental stage controlling future pollen quality. Meiosis in a Siberian fir (Abies sibirica) plantation, established in the Forest Arboretum of the Sukachev Institute, Russia, was studied from 2002 to 2004. The microsporogenesis pattern found for the Siberian fir appeared to be largely similar to that exhibited by other conifer species. Meiosis in the Siberian fir has the following characteristics: asynchrony, rapid progression of telophases I and II, and parallel and linear spindle arrangements at different meiosis II stages. General and specific meiosis irregularities were recorded at each stage. Some specific features of meiosis and the specific development of some irregularities were revealed. Pollen development analysis showed that irregular pollen grains made up less than 1% of all grains. The specific features of meiosis identified in fir trees growing in the Arboretum indicated low resistance of male reproductive structures to climatic changes and might account for high fir pollen sterility in this new environment.

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The Role of Plant Growth Regulators in the Development and Germination of Conifer Pollen

Webber

1987

Forestry Sciences

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Temperature-conditioned irregularities in pollen mother cells of Picea abies (L.) Karst

Cited by 6 publications

References 5 publications

Higher Temperature at Lower Elevation Sites Fails to Promote Acclimation or Adaptation to Heat Stress During Pollen Germination

Higher Temperature at Lower Elevation Sites Fails to Promote Acclimation or Adaptation to Heat Stress During Pollen Germination

Specific features of meiosis in the Siberian Fir (Abies sibirica) in the forest Arboretum of the V. N. Sukachev Institute, Russia

The Role of Plant Growth Regulators in the Development and Germination of Conifer Pollen

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