Počet záznamů: 1  

Hormonal and metabolic regulation of tomato fruit sink activity and yield under salinity

  1. 1.
    SYSNO ASEP0438467
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevHormonal and metabolic regulation of tomato fruit sink activity and yield under salinity
    Tvůrce(i) Albacete, A. (AT)
    Cantero-Navarro, E. (ES)
    Balibrea, M. E. (ES)
    Grosskinsky, D. K. (AT)
    de la Cruz Gonzalez, M. (ES)
    Martínez-Andújar, C. (ES)
    Smigocki, A. C. (US)
    Roitsch, Thomas (UEK-B) RID
    Pérez-Alfocea, F. (ES)
    Zdroj.dok.Journal of Experimental Botany - ISSN 0022-0957
    Roč. 65, č. 20 (2014), s. 6081-6095
    Poč.str.15 s.
    Jazyk dok.eng - angličtina
    Země vyd.GB - Velká Británie
    Klíč. slovaCell wall invertase ; cytokinins ; fruit ; salinity ; sink activity ; tomato
    Vědní obor RIVEF - Botanika
    Institucionální podporaUEK-B - RVO:67179843
    UT WOS000344658800030
    AnotaceSalinization of water and soil has a negative impact on tomato (Solanum lycopersicum L.) productivity by reducing growth of sink organs and by inducing senescence in source leaves. It has been hypothesized that yield stability implies the maintenance or increase of sink activity in the reproductive structures, thus contributing to the transport of assimilates from the source leaves through changes in sucrolytic enzymes and their regulation by phytohormones. In this study, classical and functional physiological approaches have been integrated to study the influence of metabolic and hormonal factors on tomato fruit sink activity, growth, and yield: (i) exogenous hormones were applied to plants, and (ii) transgenic plants overexpressing the cell wall invertase (cwInv) gene CIN1 in the fruits and de novo cytokinin (CK) biosynthesis gene IPT in the roots were constructed. Although salinity reduces fruit growth, sink activity, and trans-zeatin (tZ) concentrations, it increases the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) during the actively growing period (25 days after anthesis). Indeed, exogenous application of the CK analogue kinetin to salinized actively growing fruits recovered sucrolytic activities (mainly cwInv and sucrose synthase), sink strength, and fruit weight, whereas the ethylene-releasing compound ethephon had a negative effect in equivalent non-stressed fruits. Fruit yield was increased by both the constitutive expression of CIN1 in the fruits (up to 4-fold) or IPT in the root (up to 30%), owing to an increase in the fruit number (lower flower abortion) and in fruit weight. This is possibly related to a recovery of sink activity in reproductive tissues due to both (i) increase in sucrolytic activities (cwInv, sucrose synthase, and vacuolar and cytoplasmic invertases) and tZ concentration, and (ii) a decrease in the ACC levels and the activity of the invertase inhibitor.
    PracovištěÚstav výzkumu globální změny
    KontaktNikola Audesová, audesova.n@czechglobe.cz, Tel.: 511 192 268
    Rok sběru2015