Fruit growth, photosynthesis and starch accumulation are differentially affected by local variation in source/sink ratios

Belhassine, Fares; Martinez, S.; Bluy, Sylvie; Fumey, Damien; Kelner, Jean-Jacques; Costes, Evelyne; Pallas, Benoît

doi:10.17660/actahortic.2020.1281.60

Cited by 1 publication

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Suc is metabolized into hexose (Hex) by invertase through phloem unloading, resulting in a swelling pressure difference by osmosis [8]. The mass flow of water is driven by this difference in turgor, which brings assimilates from source to sink, tissues to power, and supports the growth of the latter [9]. Almost all (60−98.2%) carbon in the process of grain filling comes from this Suc breakdown [10,11].…”

Section: Introductionmentioning

confidence: 99%

Regulation of Maize Kernel Carbohydrate Metabolism by Abscisic Acid Applied at the Grain-Filling Stage at Low Soil Water Potential

et al. 2021

View full text Add to dashboard Cite

A water deficit during the grain-filling stage increases the frequency of yield loss in maize (Zea mays L.). Abscisic acid (ABA) plays a regulatory role in many stages of plant growth; however, its effects on sucrose-metabolizing enzyme activities under stress are poorly understood. The activities of cell-wall-bound acid invertase, vacuolar invertase, cytoplasmic invertase, and sucrose synthase decreased continuously under drought stress, whereas ABA treatment partially restored these activities. In addition, the increase and development of sucrose content under drought stress were related to invertase activity. Up-regulation of the activities and gene expression of cell-wall-bound acid invertase and vacuolar invertase with ABA treatment contributed to the increase in the number of rows and number of grains per row. Furthermore, ABA inhibited the increase in the length of the bald tip. Compared with the control group, water stress significantly reduced the yield index, with the lowest yield index on the 10th day of stress. These results suggest that the increase in ABA-induced sucrose-metabolizing enzyme activity might be an effective mechanism to improve maize drought resistance at the grain-filling stage.

show abstract