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Type: Journal article
Title: Salinity negatively affects pollen tube growth and fruit set in grapevines and is not mitigated by silicon
Author: Baby, T.
Collins, C.
Tyerman, S.
Gilliham, M.
Citation: American Journal of Enology and Viticulture, 2016; 67(2):218-228
Publisher: American Society for Enology and Viticulture
Issue Date: 2016
ISSN: 0002-9254
Statement of
Tintu Baby, Cassandra Collins, Stephen D. Tyerman, and Matthew Gilliham
Abstract: Soil salinity impairs viticultural production by reducing vegetative growth and yield parameters such as bud fruitfulness, bunch number per cane, bunch weight, and berry weight. However, the effects of salinity on flower fertility, berry set, and berry development, and the resulting impacts on fruit yield are not well understood. The ability of silicon (Si) to enhance salt tolerance and yield performance has been well documented for some crops. Here, we investigated whether Si could improve grapevine reproductive performance, particularly under saline conditions. One-year-old Shiraz (Vitis vinifera L.) cuttings were grown in controlled conditions and treated with salt (35 mM NaCl) and/or Si (1.5 mM K2SiO3) from budburst to veraison. Salt stress reduced fruit set by increasing flower abscission and interrupting normal berry development, which resulted in more live green ovaries and seedless berries per bunch. In vitro and in vivo studies confirmed that poor berry development due to impaired fertilization was correlated with poor pollen tube growth in the style; pollen viability and stigma receptivity were not affected by salinity. Significantly more sodium (Na+) and chloride (Cl−) were present in leaves and flowers of plants in the salt treatments compared to control plants. Silicon did not prevent the accumulation of Na+ and Cl− in reproductive organs or ameliorate the deleterious effects of salinity on reproductive capacity. However, Si-treated vines showed better instantaneous water use efficiency than control vines. This study suggests that fertilization is sensitive to salt accumulation and that salt exposure should be avoided to minimize negative effects of salinity on fruit yield.
Keywords: coulure; fruit set; millerandage; pollen tube growth; reproductive performance; salinity; silicon
Rights: Copyright © 2016 by the American Society for Enology and Viticulture. All rights reserved.
RMID: 0030046898
DOI: 10.5344/ajev.2015.15004
Grant ID:
Appears in Collections:Agriculture, Food and Wine publications

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