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001-es BibID:	BIBFORM087796
Első szerző:	Teixeira da Silva, Jaime A.
Cím:	Shoot tip necrosis of in vitro plant cultures: a reappraisal of possible causes and solutions / Jaime A. Teixeira da Silva, Esmaeil Nezami-Alanagh, María E. Barreal, Mafatlal M. Kher, Adhityo Wicaksono, Andrea Gulyás, Norbert Hidvégi, Katalin Magyar-Tábori, Nóra Mendler-Drienyovszki, László Márton, Mariana Landín, Pedro Pablo Gallego, John A. Driver, Judit Dobránszki
Dátum:	2020
ISSN:	0032-0935 1432-2048
Megjegyzések:	Shoot tip necrosis is a physiological condition and disorder that can arise in plantlets or shoots in vitro that results in death of the shoot tip. This condition, which can spread basipetally and affect the emergence of axillary shoots from buds lower down the stem, is due to the cessation of apical dominance. STN can occur at both shoot multiplication and rooting stages. One of the most common factors that cause STN is nutrient deficiency or imbalance. Moreover, the presence or absence of plant growth regulators (auxins or cytokinins) at specific developmental stages may impact STN. The cytokinin to auxin ratio within an in vitro plant can be modified by varying the concentration of cytokinins used in the culture medium. The supply of nutrients to in vitro shoots or plantlets might also affect their hormonal balance, thus modifying the occurrence of STN. High relative humidity within culture vessels and hyperhydricity are associated with STN. An adequate supply of calcium as the divalent cation (Ca2+) can hinder STN by inhibiting the accumulation of phenolic compounds and thus programmed cell death. Moreover, the level of Ca2+ affects auxin transport and ethylene production, and higher ethylene production, which can occur as a result of high relative humidity in or poor ventilation of the in vitro culture vessel, induces STN. High relative humidity can decrease the mobility of Ca2+ within a plant, resulting in Ca2+ deficiency and STN. STN of in vitro shoots or plantlets can be halted or reversed by altering the basal medium, mainly the concentration of Ca2+, adjusting the levels of auxins or cytokinins, or modifying culture conditions. This review examines the literature related to STN, seeks to discover the associated factors and relations between them, proposes practical solutions, and attempts to better understand the mechanism(s) underlying this condition in vitro.
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Boron Calcium Chloride In vitro shoots Mineral nutrient deficiency Physiological disorder Plant growth regulators
Megjelenés:	Planta. - 252 : 3 (2020), p. 1-35. -
További szerzők:	Nezami-Alanagh, Esmaeil Barreal, María E. Kher, Mafatlal M. Wicaksono, Adhityo Gulyás Andrea (1985-) Hidvégi Norbert (1986-) Magyarné Tábori Katalin (1965-) (kertészmérnök) Mendlerné Drienyovszki Nóra (1977-) (agrármérnök) Márton László Landín, Mariana Gallego, Pedro Pablo Driver, John A. Dobránszki Judit (1967-) (biológus)
Pályázati támogatás:	NKFIH-1150-6/2019 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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