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Unlike sporadic day-time heat spikes, a consistent increase in night-time temperatures can potentially derail the genetic gains being achieved. Ten winter wheat genotypes were exposed to six different night-time temperatures (15°C to 27°C) during flowering and grain-filling stages in controlled environment chambers. We identified night-time temperature of 23 C as the critical threshold beyond which a consistent decline in yield and quality was observed. Confocal laser scanning micrographs of central endosperm, bran and germ tissue displayed differential accumulation of protein, lipid and starch with increasing night-time temperatures. KS07077M-1 recorded a decrease in starch and increase in protein and lipid in central endosperm with increasing night-time temperatures, while the same was significantly lower in SY Monument. Expression analysis of genes encoding 21 enzymes (including isoforms) involved in grain-starch metabolism in developing grains, revealed high night-time temperature (HNT) induced reduction in transcript levels of ADP-glucose pyrophosphorylase small subunit involved in starch synthesis and a ≥ 2-fold increase in starch degrading enzymes isoamylase III, alpha- and beta-amylase. The identified critical threshold, grain compositional changes and the key enzymes in grain starch metabolism that lead to poor starch accumulation in grains establish the foundational knowledge for enhancing HNT tolerance in wheat.
This article was published in the following journal.
Name: Plant, cell & environment
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Abnormally high temperature intentionally induced in living things regionally or whole body. It is most often induced by radiation (heat waves, infra-red), ultrasound, or drugs.
SEEDS used as a major nutritional source, most often the grain from the POACEAE family.
Nutritive tissue of the seeds of flowering plants that surrounds the EMBRYOS. It is produced by a parallel process of fertilization in which a second male gamete from the pollen grain fuses with two female nuclei within the embryo sac. The endosperm varies in ploidy and contains reserves of starch, oils, and proteins, making it an important source of human nutrition.
Abnormally low BODY TEMPERATURE that is intentionally induced in warm-blooded animals by artificial means. In humans, mild or moderate hypothermia has been used to reduce tissue damages, particularly after cardiac or spinal cord injuries and during subsequent surgeries.
A hardy grain crop, rye, grown in northern climates. It is the most frequent host to ergot (CLAVICEPS), the toxic fungus. Its hybrid with TRITICUM is TRITICALE, another grain.
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