REACŢIA FORMELOR PARENTALE ŞI HIBRIZILOR F2 DE TOMATE LA TEMPERATURI STRESANTE

  • Nadejda MIHNEA Institutul de Genetică, Fiziologie şi Protecţie a Plantelor
  • Diana CLIMĂUȚAN Institutul de Genetică, Fiziologie și Protecție a Plantelor, Republica Moldova
  • Cristian ROȘCA Institutul de Genetică, Fiziologie și Protecție a Plantelor, Republica Moldova

Abstract

Abstract. The paper presents data on the response of F2 hybrid combinations and parental forms of tomato at different temperatures (optimal 250 C and stressful 400 , 420 C), tested in laboratory conditions. It was established that stressful temperatures significantly affect the early ontogenesis of tomato varieties and hybrids by suppressing the growth of the embryonic root, stem and seedling (sometimes by stimulating them). Cluster analysis by the k-media method demonstrated that stressful temperatures manifested a higher discriminating ability of tomato clusters for seedling length and embryonic root length characters, which reveals a more pronounced specificity of interaction at these temperatures. Florina, Wake, Prestij and Rome varieties and F2 hybrid combinations Mary Gratefullt x Pontina, Prestij x Pontina, Rome x Wake have the highest complex resistance in terms of the reaction of the embryonic root, stem and seedling at 420 C temperature. They are of interest in the further process of breeding.


Key words: Lycopersicon esculentum; Temperature; Heat resistance; Evaluation; Embryonic root; Embryonic stem; Seedling; Length; Variability.


Rezumat. În lucrare sunt prezentate date cu privire la reacția combinațiilor hibride F2 și a formelor parentale de tomate la diferite niveluri de temperatură (optimală – 250 C și stresante – 400 , 420 C), testate în condiții de laborator. S-a stabilit că temperaturile stresante influențează semnificativ ontogeneza timpurie a soiurilor și hibrizilor de tomate prin reprimarea creșterii rădăciniței, tulpiniței și plantulei (uneori prin stimularea acestora). Analiza clusteriană prin metoda k-mediilor a demonstrat că temperaturile stresante au manifestat o capacitate discriminantă mai înaltă a clusterelor de tomate pentru caracterele lungimea plantulei și lungimea rădăciniței, ceea ce relevă specificitatea de interacțiune mai pronunțată cu aceste temperaturi. Soiurile Florina, Deșteptarea, Prestij, Roma și combinațiile hibride F2 Mary Gratefully x Pontina, Prestij x Pontina, Roma x Deșteptarea au înregistrat cea mai înaltă rezistență complexă în ceea ce privește reacția rădăciniţei, tulpiniţei și plantulei la temperatura de 420 C, astfel acestea prezintă interes în procesul de ameliorarea de mai departe.


Cuvinte-cheie: Lycopersicon esculentum; Temperatură; Rezistenţă la căldură; Evaluare; Rădăciniţă; Tulpiniţă; Plantulă; Lungime; Variabilitate.

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Published
2022-08-18
How to Cite
MIHNEA, Nadejda; CLIMĂUȚAN, Diana; ROȘCA, Cristian. REACŢIA FORMELOR PARENTALE ŞI HIBRIZILOR F2 DE TOMATE LA TEMPERATURI STRESANTE. Stiinta agricola, [S.l.], n. 1, p. 42-49, aug. 2022. ISSN 2587-3202. Available at: <https://sa.uasm.md/index.php?journal=sa&page=article&op=view&path%5B%5D=774>. Date accessed: 24 sep. 2022.
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