Dodajanje kalcija zmanjšuje slanostni stres pri kokosovi palmi (Phoenix dactylifera 'Berhi’ in ‘Sayer’)

Abbas M. JASIM, Muayed F. ABBAS, Hussein J. SHAREEF

Povzetek


Pri dveh sortah kokosove palme (Phoenix dactylifera ‘Berhi’ in ‘Sayer’) je bil preučevan blažilni učinek dodajanja kalcija na negativne učinke slanostnega stresa (15.9 dS m-1). Ca-gnojili Polixal in Rexene sta bili dodajani ali kot talni dodatek ali kot listno pršilo. Rezultati so pokazali, da je dodatek Polixal-a v količini 30 ml na rastlino značilno povečal višino rastlin, listno površino, vsebnost celokupnega klorofila, relativno vsebnost vode (RWC), vsebnost prolina, aktivnost peroksidaze, vsebnost IAA in K+ ter razmerje K+/Na+ v listih sorte Berhi, aktivnost katalaze, vsebnost ABA in Cl- so se zmanjšali. Sorta Berhi se je bolje odzvala na dodatek gnojil v tla kot na foliarna gnojila. Calcijeva gnojila so pri obeh sortah zmanjšala slanostni stres na bogatih peščeno-ilovnatih tleh, vendar se je sorta Berhi izkazala nanj odpornejša kot sorta Sayer saj je ohranjala večje K+/Na+ razmerje, kar je izboljšalo tudi razmerje med IAA in ABA. Rezultati te raziskave nakazujejo, da gnojenje s Ca izboljša obrambni sistem rastlin v razmerah slanostnega stresa.

Ključne besede


antioksidacijski encimi, dateljeva palma, slanostni stres, IAA, ABA, gnojenje s Ca, prolin, RWC

Celotno besedilo:

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DOI: http://dx.doi.org/10.14720/aas.2016.107.1.11

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