Effects of deficit irrigation during flower initiation of two blackcurrant (Ribes nigrum L.) cultivars

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• 作者：N. 膶erekovi膰^a ; ^{Natasa.Cerekovic@agrsci.dk" class="auth_mail} ; M. Pagter^a ; ¹ ; ^{Pagter@mpimp-golm.mpg.de" class="auth_mail} ; H.L. Kristensen^a ; ^{Hanne.Kristensen@agrsci.dk" class="auth_mail} ; R. Brennan^b ; ^{Rex.Brennan@hutton.ac.uk" class="auth_mail} ; K.K. Petersen^a ; ^{KarenK.Petersen@agrsci.dk" class="auth_mail}
• 关键词：BH ; &lsquo ; Ben Hope&rsquo ; DI ; deficit irrigated ; ea ; actual vapour pressure ; es ; saturated vapour pressure ; ETc ; accumulated evapotranspiration ; FI ; fully irrigated ; gs ; stomatal conductance ; T ; &lsquo ; Titania&rsquo ; RWC ; relative water content ; VPD ; vapour pressure deficit ; 蠄l ; leaf water potential ; 蠄蟺 ; leaf osmotic potential ; 蠄p ; leaf turgor
• 刊名：Scientia Horticulturae
• 出版年：26 March, 2014
• 年：2014
• 卷：168
• 期：Complete
• 页码：193-201
• 全文大小：1669 K

文摘

The tolerance to water deficit and ability to recover was studied during flower initiation in two blackcurrant cultivars (Ribes nigrum L., 鈥楾itania鈥?and 鈥楤en Hope鈥?. The experiment was conducted under greenhouse conditions, and plants were either fully irrigated (FI), with a volume of water replacing the previous day's evapotranspiration, or deficit irrigated (DI) for 3, 4, 5, 7 or 10 days. Deficit-irrigated plants received a volume of nutrient solution corresponding to 50% of the volume supplied to FI plants. Here after full irrigation was continued (FI) or resumed (DI) to allow for 2 and 10 days of recovery for stomatal conductance and leaf area increment, and 7 and 14 days of recovery for root intensity. Full irrigation was continued until the spring when the numbers of strigs and flowers per node were recorded.

Deficit irrigation reduced the accumulated evapotranspiration (ET_c), relative water content (RWC), leaf water potential (蠄_l), osmotic potential (蠄_蟺) and turgor (蠄_p) in both cultivars. Stomatal conductance (g_s) was reduced due to deficit irrigation, but more so in 鈥楤en Hope鈥?than in 鈥楾itania鈥? indicating that 鈥楤en Hope鈥?is more affected by drought stress than 鈥楾itania鈥? In both cultivars, deficit irrigation led to a significant decrease in the area of developing leaves, implying that leaf development of blackcurrant is sensitive to drought stress. Following deficit irrigation the speed of recovery of g_s was faster in 鈥楾itania鈥?than in 鈥楤en Hope鈥? whereas root growth remained more inhibited in 鈥楾itania鈥?than 鈥楤en Hope鈥?during recovery. This supports the proposition that 鈥楤en Hope鈥?is more affected by drought stress than 鈥楾itania鈥? In the long term, deficit irrigation reduced the number of strigs and flowers per node in 鈥楤en Hope鈥? whereas in 鈥楾itania鈥?high temperature during flower initiation seemed more important for the formation of flower initials than water availability.

Overall, the results of this study stress the importance of postharvest irrigation and breeding for cultivars that are tolerant to drought stress and high temperatures during flower initiation in order to meet future climate changes.