Future increases in temperatures are expected to advance grapevine phenology and shift ripening to warmer months, leaving a longer post-harvest period with warmer temperatures. Accumulation of carbohydrates occurs during post-harvest, and has an influence on vegetative growth and yield in the following growing season. This study addressed the possibility of adopting regulated deficit irrigation (RDI) during post-harvest in Chardonnay. Four irrigation treatments during post-harvest were applied over three consecutive seasons: (i) control (C), with full irrigation; (ii) low regulated deficit irrigation for sparkling base wine production (RDIL SP), from harvest date of sparkling base wine, irrigation when stem water potential (Ψstem) was less than −0.9 MPa; (iii) mild regulated deficit irrigation for sparkling base wine production (RDIM SP), from harvest date of sparkling base wine, irrigation when Ψstem was less than −1.25 MPa; (iv) mild regulated deficit irrigation for wine production (RDIM W), from harvest data of wine, irrigation when Ψstem was less than −1.25 MPa. Root starch concentration in full irrigation was higher than under RDI. Yield parameters did not differ between treatments, but differences in berry composition were detected. Considering that the desirable berry composition attributes of white varieties are high in titratable acidity, it would seem inappropriate to adopt RDI strategy during post-harvest. However, in a scenario of water restriction, it may be considered because there was less impact on yield and berry composition than if RDI had been adopted during pre-harvest.
T. (2019). Long proleptic and sylleptic shoots in peach (Prunus persica L. Batsch) trees have similar, predetermined, maximum numbers of nodes and bud fate patterns. Annals Of Botany, 123(6), 993-1004. doi:10.1093/aob/mcy232 is available online at: https://academic.oup.com/aob/article-abstract/123/6/993/5272580 and https://doi.org/10.1093/aob/mcy232 Document downloaded from: Original Article 1 Long proleptic and sylleptic shoots in peach (Prunus persica L. Batsch) trees have 2 similar, pre-determined, maximum numbers of nodes and bud fate patterns 3 12 13 14 Background and Aims In peach (Prunus persica L. Batsch) trees, three types of shoots 1 can be distinguished depending on the time of their appearance: sylleptic, proleptic and 2 epicormic. On proleptic shoots, an average of ten phytomers are preformed in dormant 3 buds prior to shoot growth after budbreak, whereas all phytomers are considered 4 neoformed in sylleptic and epicormic shoots. However, casual observations indicated 5 that proleptic and sylleptic shoots appear quite similar in number of phytomers and 6 structure in spite of their different origins. The goal of this research was to test the 7 hypothesis that both proleptic and sylleptic shoots exhibit similar growth characteristics 8 by analyzing their node numbers and bud fate patterns. If their growth characteristics 9 are similar, it would indicate that the structure of both types of shoots is primarily under 10 genetic rather than environmental control. 11 Methods The number of phytomers and bud fate patterns of proleptic and sylleptic 12 shoots of four peach cultivars grown in the same location (Winters, California) were 13 analyzed and characterized using hidden semi-Markov models. Field data was collected 14 during winter 2016, just prior to floral budbreak. 15 Key Results Sylleptic shoots tended to have slightly fewer phytomers than proleptic 16 shoots of the same cultivars. The bud fate patterns along proleptic and sylleptic shoots 17were remarkably similar for all the cultivars although proleptic shoots started growing 18 earlier (at least one month) in the spring than sylleptic shoots.
19Conclusions This study provides strong evidence for the semi-deterministic nature of 20 both proleptic and sylleptic shoots across four peach cultivars in terms of number of 21 phytomers and bud fate patterns along shoots. It is apparent that the overall structure of 22 shoots with similar numbers of phytomers was under a similar genetic control for both 23 shoot types. Understanding shoot structural characteristics can aid in phenotypic 24 characterization of vegetative growth of trees, as well as provide a foundation for 1 vegetative management of fruit trees in horticultural settings. 2
Water stress during the post-harvest period affects new root formation but not starch concentration and content in Chardonnay grapevine (Vitis vinifera L.
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