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High night temperature induced changes in grain starch metabolism alters starch, protein and lipid accumulation in winter wheat.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "High night temperature induced changes in grain starch metabolism alters starch, protein and lipid accumulation in winter wheat."

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.

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This article was published in the following journal.

Name: Plant, cell & environment
ISSN: 1365-3040
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Medical and Biotech [MESH] Definitions

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.

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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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