Harper; Temperature stress and plant sexual reproduction: The reproductive gametophytic phase in flowering plants is often highly sensitive to hot or cold temperature stresses, with even a single hot day or cold night sometimes being fatal to reproductive success. This review describes studies of temperature stress on several crop plants, which suggest that pollen development and fertilization may often be the most sensitive reproductive stage. Transcriptome and proteomic studies on several plant species are beginning to identify stress response pathways that function during pollen development.
An example is provided here of genotypic differences in the reproductive stress tolerance between two ecotypes of Arabidopsis thaliana Columbia Col and Hilversum Hi-0 , when reproducing under conditions of hot days and cold nights. Hi-0 exhibited a more severe reduction in seed set, correlated with a reduction in pollen tube growth potential and tropism defects.
Hi-0 thus provides an Arabidopsis model to investigate strategies for improved stress tolerance in pollen. Understanding how different plants cope with stress during reproductive development offers the potential to identify genetic traits that could be manipulated to improve temperature tolerance in selected crop species being cultivated in marginal climates.
While temperature and other abiotic stresses are clearly limiting factors for crops cultivated on marginal lands, crop productivity everywhere is often at the mercy of random environmental fluctuations.
Current speculation about global climate change is that most agricultural regions will experience more extreme environmental fluctuations Solomon et al.
Sexual Reproduction in Flowering Plants
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Reproduction in Plants
Microarray analysis also showed many up-regulated genes that are representative of previously characterized temperature stress pathways Frank et al. For example, a high frequency of flower abortion in response to low temperatures is well documented for chickpea Cicer arietinum Croser et al.
Insects, such as bees, are important agents of pollination. CDPKs are implicated in transducing calcium signals to stimulate pollen tube growth and to mediate tropism Myers et al. High temperature stress of Brassica napus during flowering reduces micro- and megagametophyte fertility, induces fruit abortion, and disrupts seed production. In angiosperms, one sperm fertilizes the egg to form the 2n zygote, and the other sperm fertilizes the central cell to form the triploid 3n endosperm.
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- Plant Reproduction | Biology
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Pollen development and function: The eight embryo sac cells differentiate into two synergids, three antipodal cells, two fused endosperm nuclei, and an egg cell. Type the code shown: Diagram depicting the reciprocal crossing strategy employed in experiments to determine the reproductive tissue responsible for temperature stress sensitivity.
The immature anther top contains four microsporangia, or pollen sacs.
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