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Water stress improves whole-canopy water use efficiency and berry composition of cv. Sangiovese (Vitis vinifera L.) grapevines grafted on the new drought-tolerant rootstock M4

Author

Listed:
  • Merli, M.C.
  • Magnanini, E.
  • Gatti, M.
  • Pirez, F.J.
  • Pueyo, I. Buesa
  • Intrigliolo, D.S.
  • Poni, S.

Abstract

Testing of new rootstocks for drought tolerance targets traditionally rain-fed districts where supplemental irrigation is more frequently needed due to the pressures of global warming. A seasonal evaluation of whole-canopy gas exchange, water-use efficiency (WUEc), yield components and compositional traits of Vitis vinifera cv. Sangiovese grafted to the new drought-tolerant genotype M4 against the commercial SO4 stock is reported. The experiment was conducted in 2015 on twelve four-year-old, fruiting potted Sangiovese grapevines grafted on M4 and SO4 stocks and assigned to SO4-WW (well-watered), SO4-WS (water-stressed), M4-WW and M4-WS treatments. Water deficit was imposed pre-veraison by reducing water supply to 50% of whole-canopy demand derived from concurrent measurements of transpiration in WW and maintained until three weeks after veraison prior to full rewatering. While WUEc was unchanged in WS-SO4 as compared to WW-SO4, WUEc in WS-M4 increased by 22% vs. WW-M4 over the whole water deficit period and such gain was partially maintained upon rewatering. Higher WUEc in WS-M4 resulted from an ability to maintain canopy photosynthesis similar to WS-SO4 at a reduced water use. Although yield per vine was similarly reduced in the two WS treatments (about 1kg less than WW), overall grape composition was improved in WS-M4 and worsened in WS-SO4 when compared to the WW controls. Total soluble solids (°Brix) rose by 11% in WS-M4 vs. the respective control, whereas in WS-S04 there was a slight decrease (−0.6 Brix). Most notably, anthocyanins accumulation was largely limited in vines grafted on SO4 (−45% vs. WW-SO4 when given on a concentration basis), while in M4-grafted plants berry pigmentation slightly improved vs. WW (+12.5%). Hypothesis is made that grafting onto different stocks can trigger differential gene regulation under water stress and high temperatures leading to different sensitivity in synthesis and/or degradation of already formed anthocyanins.

Suggested Citation

  • Merli, M.C. & Magnanini, E. & Gatti, M. & Pirez, F.J. & Pueyo, I. Buesa & Intrigliolo, D.S. & Poni, S., 2016. "Water stress improves whole-canopy water use efficiency and berry composition of cv. Sangiovese (Vitis vinifera L.) grapevines grafted on the new drought-tolerant rootstock M4," Agricultural Water Management, Elsevier, vol. 169(C), pages 106-114.
    • Handle: RePEc:eee:agiwat:v:169:y:2016:i:c:p:106-114
    DOI: 10.1016/j.agwat.2016.02.025
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    Cited by:

    1. Buesa, I. & Torres, N. & Tortosa, I. & Marín, D. & Villa-Llop, A. & Douthe, C. & Santesteban, L.G. & Medrano, H. & Escalona, J.M., 2023. "Conventional and newly bred rootstock effects on the ecophysiological response of Vitis vinifera L. cv. Tempranillo," Agricultural Water Management, Elsevier, vol. 289(C).
    2. Long, Kaisheng & Pijanowski, Bryan C., 2017. "Is there a relationship between water scarcity and water use efficiency in China? A national decadal assessment across spatial scales," Land Use Policy, Elsevier, vol. 69(C), pages 502-511.

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