Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Influence of plant growth regulators on sex differentiation and floral characteristics of pomegranate flowers: a case of brassinosteroids

100%

Gokbayrak Z. , Engin H.

nr 3

The objective of the present study was to determine the effects of brassinosteroid application on the sex determination and floral growth of pomegranate flowers. Whole tress of Punica granatum ‘Mayhoş-8’ were sprayed with 0.001, 0.01, and 0.1 mg L⁻¹ 28-homobrassinolide (Hbr) at bud break. The selection of flowers was based on the appearance of a visible pistil/stigma and shape of the ovary of intact flowers. Grouping of bisexual flowers was based on their flower position, i.e., single, terminal, and lateral flowers, during the first flush of flowering in mid-June. Approximately 20 days and 40 days after spraying, 100 randomly chosen bisexual flowers per collection time were collected and measurements of floral parts were immediately taken. The differences between bisexual and functional male flowers were not distinct enough to assert any significant effects from the different Hbr treatments. Irrespective of treatments, the percentage of male flowers was higher than that of bisexual flowers. Hbr treatments applied at the bud break period had significant effects only on bisexual flowers that developed as single flowers. Applying 0.01 mg L⁻¹ Hbr produced comparably lower percentages of single bisexual flowers (53.4%). Although the 0.1 and 0.001 mg L⁻¹ Hbr treatments resulted in increased percentages of bisexual flowers, the difference was not significant. For the first collection time (mid-June), the effects of Hbr concentration on the size of the floral parts for bisexual flowers were only significant in ovary width and stigma diameter. As the concentration decreased, smaller ovaries were obtained. During the second flowering, application of 0.01 mg L⁻¹ Hbr considerably increased the overall sizes of floral parts in bisexual flowers. Hbr might affect the ratio of flower formation in certain positions on a branch and could influence the growth of floral parts in bisexual flowers. Further elucidation of these effects would help to better understand floral organ development in plants.

Effects of cane-girdling and cluster and berry thinning on berry organic acids of four Vitis vinifera L. table grape cultivars

80%

Keskin N. , Isci B. , Gokbayrak Z.

nr 6

The response of berry organic acids of four organically grown table grape cultivars to cane-girdling and cluster-berry thinning treatments were evaluated over two growing seasons. In addition pH, titratable acidity, soluble solids content and maturity index were also determined. Statistical analyses showed that individual organic acid content of the four grape cultivars were significantly affected by the treatments. Tartaric and malic acids of ‘Red Globe’ were mostly influenced by the cluster-berry thinning treatment. ‘Alphonse Lavalleé’ accumulated the highest tartaric acid and malic acid in both the girdled/thinned and the cluster-berry thinned vines, respectively. The control and girdled ‘Trakya Ilkeren’ vines had the most tartaric acid. Control vines also contained high malic acid amount. ‘Buca Razakısı’, on the other hand, had the most prominent tartaric and malic acid levels in the girdled/thinned and thinned vines, respectively. Quality parameters also showed significant differences among the cultivars in response to the treatments.

Oceniono reakcję zawartości kwasów organicznych w czterech odmianach winogron przeznaczonych do bezpośredniego spożycia na zabiegi obrączkowania i przycinania w okresie dwóch okresów wegetacyjnych. Poza tym określono pH, kwasowość miareczkowaną, zawartość substancji rozpuszczalnych sałych oraz indeks dojrzałości. Analizy statystyczne pokazały, że na indywidualną zawartość kwasów organicznych czterech odmian wymienione zabiegi wpływały istotnie . Zabieg przycinania gron najbardziej wpłynął na zawartość kwasu winowego i kwasu jabłkowego odmiany ‘Red Globe’. Odmiana ‘Alphonse Lavalleé’ gromadziła najwięcej kwasu winowego i kwasu jabłkowego odpowiednio w winoroślach opaskowanych/przycinanych i w winoroślach z przycinanymi gronami. Winorośle ‘Trakya Ilkeren’ kontrolne i przycinane miały największą zawartość kwasu winowego. Winorośle kontrolne również zawierały dużą ilość kwasu octowego. Natomiast odmiana ‘Buca Razakısı’ miała najbardziej wyróżniającą się zawartość kwasu winowego i octowego odpowienio w opaskowanych/przycinanych oraz przycinanych winoroślach. Paramentry jakościowe także wykazywały istotne różnice między odmianami w reakcji na zabiegi.