The effect of drought hardening and chilling on ABA content in xylem sap and ABA - delivery rate from root of tomato plant

• Autorzy: Starck Z , Choluj D. , Gawronska H.
• Języki publikacji: EN

Abstrakty

EN

This paper is a continuation of our studies related to the response of two tomato cultivars: Robin and New Yorker to chilling: the later is more tolerant to chilling than the former one (Starck et al. 1994). The concentration of ABA in the xylem sap and ABA delivery rate (calculated as the amount of ABA exuded in 2h from the cut stump, following shoot removal) were estimated by ELISA. The relative water content (RWC) of the leaf blades and stomatal resistance (RS) were also measured. Tomato plants were grown in a greenhouse, under noncontrolled conditions. Before chilling some of the plants were drought hardened for 10 days (H). As an consequence of water deficit only New Yorker growth slightly decreased. Plants were chilled to 2–5 °C during three consecutive, 16-h nights, preceded by warm days, which caused a decrease in the RWC of leaf blades. Chilling did not decreased leaf blade hydration significantly, but drastically increased the concentration of ABA in the xylem sap in more chilling tolerant cv. New Yorker only. The delivery rate of ABA was markedly enhanced in both cultivars, but much more in New Yorker. Drought hardening increased ABA delivery rate in cv. Robin only, especially after chilling. The lack of correlation between changes in the RWC of leaf blades after low temperature treatment and the concentration of ABA in the xylem sap as well as its delivery rate suggest, that in both tomato cultivars chilling increased ABA level directly, not as an secondery effect of temperature-induced water deficit.

Słowa kluczowe

EN

Lycopersicon esculentum; hardening; abscisic acid; Robin cultivar; New Yorker cultivar; chilling; drought; water stress; root; tomato

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 1998
• Tom: 20
• Numer: 1
• Opis fizyczny: p.41-48,fig.

Twórcy

autor

Starck Z

• Warsaw Agricultural University, 02-528 Warsaw, Rakowiecka 26-30, Poland

autor

Choluj D.

autor

Gawronska H.

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