Partitioning and mobilization of starch and N reserves in grapevine (Vitis vinifera L.)

Carbon balance, partitioning and photosynthetic acclimation in fruit-bearing grapevine (Vitis vinifera L. cv. Tempranillo) grown under simulated climate change (elevated CO2, elevated temperature and moderate drought) scenarios in temperature gradient greenhouses

“…Carbon partitioning 15 among sinks is regulated by the sink themselves and their ability to import 16 photoassimilates (Patric, 1997;Botas, 2004;Zapata et al, 2004). Although a large C-17 labeling was expected in leaves and berries, our results revealed that an important 18 fraction of photoassimilates remained in leaves and the rest was partitioned toward 19 storage organs like the stem and roots (Botas, 2004;Zapata et al, 2004).…”

Starch, growth, and development in cuttings of rootstock 'Paulsen 1103' from plants infested with ground pearl

“…Therefore, if it was considered that the ground pearl has a cycle of about 1 year in southern Brazil (BOTTON et al, 2004) and that phases of higher metabolic activity and growth of the vine (increased circulation of nutrients) and of the insect are coincident in the warmer months of the year (October-April for the southern hemisphere), the lower growth observed in the branches may be a consequence of the diversion of nutrients related to the eating habits of the cochineal. Being a sucking insect, the ground pearl feeds directly from the vascular bundles of the vine, acting as a sap drain, and can divert substantial amounts of plant nutrients (ZAPATA et al, 2004).…”

“…This response can be explained by the similarity in starch content of the plants from the I and NI beds (Figure 2). According to ZAPATA et al (2004), starch accumulation in the cutting effectively influences the budding of the next cycle, supporting initial growth until the first leaves reach photosynthetic maturity to meet the carbon demand.…”

“…It is known that infested plants tend to produce smaller branches, as observed for scion cultivars, with the possibility of small changes in starch content in the branches (ZART et al, 2014). The amount of starch present in the cutting may affect the viability and production of shoots and roots, which results in the highest quality and vigor of the seedling (ZAPATA et al, 2004). Therefore, any reduction in the health of rootstock can also affect the grafting and the initial development and survival of future seedlings, affecting the uniformity of the vineyards.…”

Recuperação e distribuição do nitrogênio fornecido a videiras jovens

“…A outra parte é acumulada na forma de compostos nitrogenados de baixo peso molecular, nos órgãos perenes, especialmente nas raízes (Zapata et al, 2004;Brunetto et al, 2005), sendo mobilizadas e redistribuídas para os órgãos anuais no crescimento do próximo ciclo vegetativo (Conradie, 1990).…”