Potassium nitrate improves citrus seedling growth under salt stress

CaCl2, Citrus, Citrus, K2O, KNO3, Mandarin, Mandarin, NaCl, NOP, Orange, Orange, Photosynthesis, Photosynthesis, Potassium, Potassium, Potassium nitrate, Salinity, Salinity, Salt tolerance, Salt tolerance, Sensitive to salt, Sodium chloride, Sodium chloride, Tangerine, Tangerine,

A greenhouse experiment was carried out with 1-year old cuttings of Navelina Citrus sinensis (L.) Osbeck grafted on rootstocks of Carrizo citrange (Citrus sinensis (L.) Osbeck x Poncirus trifoliata (L.) Raf.), Citrus macrophylla Wester or Cleopatra mandarin (Citrus reshni Hort. Ex Tanaka). The plants were grown for 60 days in pots with a mixture of sand and peat (85:15), and were watered three times a week. The control treatment was watered with water, the saline treatment with water containing 25 mM NaCl:_CaCl2 (15:1), and the saline + nitrate supplement treatment with water containing 25 mM NaCl:_CaCl2 plus 10 mM _KNO3. Salt stress reduced total plant biomass by 27-38%, while potassium nitrate supplementation partially counteracted this effect, increasing total plant dry matter. Potassium nitrate supplementation increased total plant biomass of salt-treated seedlings by 22-36% in all three rootstocks (Figure 1). Salt-stressed plants had lower photosynthetic rates than the control. Addition of KNO3_increasedphotosynthetic rates of salt-treated Navelina orange by 25-30% in scions grafted on Carrizo citrange or C. macrophylla, and by 66% in scions grafted on Cleopatra mandarin. KNO3 supplementation_alsoreduced leaf abscission in all three rootstocks under salinity conditions (Table 1). In addition, the increase in leaf biomass induced by potassium nitrate resulted in the dilution of chloride in leaves and roots, generating a reduction in chloride concentration, the critical parameter for salt damage.

Effect of treatment on total dry mass (g) for Navelina citrus grafted on three different citrus rootstocks. Table 1. Effect of treatment on leaf abscission (%) for Navelina citrus grafted on three different citrus rootstocks.

Autor

Iglesias, D. J., Y. Levy, A. Gòmez-Cadenas, F.R. Tadeo, E. Primo-Millo and M. Talon. 2004. Nitrate improves growth in salt-stressed citrus seedlings through effects on photosynthetic activity and chloride accumulation. Tree physiology, 24: 1027-1034.

Otros Articulos

Qrop® Mix en aplicaciones fraccionadas según la etapa del cultivo de papa

Efecto de ProHydriQ® en el calibre de bayas en uva de mesa

Nutrición de plantaciones de arándano con Ultrasol®ine K Plus y Ultrasol® Magnum Special en Polonia