期刊
SCIENTIA HORTICULTURAE
卷 277, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scienta.2020.109807
关键词
Biostimulant; Viticulture; Drought; Photosystems' efficiency; Seaweed extract; Photosynthesis; Foliar; Water use efficiency; Vitis vinifera
类别
This study showed that foliar applications of A. nodosum extracts could be an alternative sustainable tool to improve grapevine physiological performances under mild-to-moderate water deficit and to preserve photosystems integrity and vineyard resilience when water limiting conditions get more severe.
Biostimulants have recently been used in sustainable agriculture systems to improve plant growth and resilience to biotic and abiotic stress. In this study, foliar (ANEfl) and soil (ANEsl) A. nodosum extract applications were studied to elucidate the impact of different delivery methods on grapevines physiology either under well-watered conditions (WW) or under a water deficit period and a subsequent water recovery (WS). ANEfl increased leaf soluble sugars and photosynthesis of WW vines. Under progressive WS conditions, ANEfl positively impacted leaf gas exchange and water use efficiency (+35 % as compared to untreated vines) at Psi(stem) about-0.65 MPa. Photosynthesis was also improved during the re-watering period (+2.7 mu mol CO2 m(2) s(-1)) via preserved photochemical efficiency (Fv/Fm +0.19 as compared to untreated vines) and enhanced leaf anatomical and biochemical traits (+8% leaf dry matter and +27.3 mg/g DW of leaf soluble sugars). Contrarily, when soil applied, A. nodosum extracts did not significantly improve vine physiology during the reduced water supply period and only mild effects were detected at re-watering. Results demonstrates that foliar applications of A. nodosum extracts could be an alternative sustainable tool to improve grapevine physiological performances under mild-to-moderate water deficit and to preserve photosystems integrity and vineyard resilience when water limiting conditions get more severe.
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