The spatial and temporal distribution of auxin and gibberellin in sunflower (Helianthus annuus L.)

Indol-3-asetik asit (IAA) ve gibberellinlerin (GA3) paralel variyasyon ve meydana gelişleri bilateral simetrik organizma Helianthus annuus L.'nin farklı organlarında araştırıldı. Kök sistemine oranla toprak üstü organlarının hormon içeriklerinin eşit olmayan bir şekilde dağılım gösterdiği saptandı. Genotip variyasyonu ortaya kondu. Fj hibridinin kök, yaprak, infloresans ve çiçeklerindeki IAA konsantrasyonu, kendine döllenen hatlardan daha yüksek bulundu. Bu veriler oksin ve melez dinçliği arasındaki doğrudan ilişkiyi göstermektedir. En yüksek GA3 konsantrasyonu RW 637 Rf hattının yapraklarında saptandı. GA3 konsantrasyonu ontogenezde artarken, IAA konsantrasyonu gelişimle uyumluluk göstermiştir. Elde edilen veriler, ayçiçeğinde spatiyal (kök, gövde, yaprak ve çiçek) ve temporal (farklı, ontogenetik fazlar) dağılımın polarite oluşumu ve gelişimle ilgisini doğrulamaktadır.

Ayçiçeği bitkisinde (Helianthus annuus L.) oksin ve gibberellinlerin yer ve zamana bağlı dağılımı

The occurrence and the parallel variation of indole- 3-acetic acid (IAA) and gibberellins (GA3) in different organs of Helianthus annuus L. - bilaterally symmetric organism - were investigated at various developmental stages. It has been established unequal quantitative distribution characterized by higher hormone contents in the aerial organs in comparison with the root system. The genotype variation was revealed. The concentration of IAA in roots, leaves, inflorescences and flowers of the hybrid ¥x was higher than in inbred lines. These data demonstrate the direct correlation between auxin and hybrid vigor. The highest GA3 concentrations have been determined in leaves of the RW 637 Rf line. The GA3 concentration increases in ontogenesis while IAA concentration associated with centers of development. The obtained results demonstrate the spatial (roots, leaves, inflorescences, and flowers) and temporal distribution (at the diverse ontogenetic phases), that confirms the implication of these in polarity formation and developmental centers succession at sunflower.

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