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Influence of seed germination dynamics on quality of tomato seedlings

100%

Rozek E.

tom 52

nr 1-2

The influence of seed germination dynamics on selected features of the seedling of 4 tomato cultivars (Beta, Betalux, Promyk, New Yorker) meant for field cultivation were investigated. It was shown "that flowering was the earliest in combinations with plants received from the seeds of the fastest germination, while the greatest delay of flowering was observed in plants received from the seeds of the longest germination (after 10 days). Plants grown from the seeds which had germinated the fastest were significantly higher, had greater average number of leaves, and had greater mass than plants from the seeds germinating longer. Further observations carried out at the moment of flowering of plants of all combinations did not show any significant differences in terms of investigated features except average height of plants.

Badano wpływ dynamiki kiełkowania nasion na wybrane cechy rozsady 4 odmian pomidora (Beta, Betalux, Promyk, New Yorker) przeznaczonych do uprawy w polu. Wykazano, że kwitnienie z reguły rozpoczynało się w kombinacjach z roślinami uzyskanymi z nasion kiełkujących najszybciej, a największe opóźnienie w zakwitaniu wykazywały rośliny uzyskane z nasion kiełkujących najdłużej (po 10 dniach). Rośliny wyrosłe z nasion kiełkujących najszybciej były istotnie wyższe, charakteryzowały się większą średnią liczbą liści i masą w porównaniu z roślinami wyrosłymi z nasion kiełkujących dłużej. Dalsze obserwacje przeprowadzone w momencie kwitnienia roślin z wszystkich kombinacji nie wykazały już istotnych różnic pod względem badanych cech z wyjątkiem średniej wysokości roślin.

The effect of drought hardening and chilling on ABA content in xylem sap and ABA - delivery rate from root of tomato plant

100%

Starck Z. , Choluj D. , Gawronska H.

tom 20

nr 1

This paper is a continuation of our studies related to the response of two tomato cultivars: Robin and New Yorker to chilling: the later is more tolerant to chilling than the former one (Starck et al. 1994). The concentration of ABA in the xylem sap and ABA delivery rate (calculated as the amount of ABA exuded in 2h from the cut stump, following shoot removal) were estimated by ELISA. The relative water content (RWC) of the leaf blades and stomatal resistance (RS) were also measured. Tomato plants were grown in a greenhouse, under noncontrolled conditions. Before chilling some of the plants were drought hardened for 10 days (H). As an consequence of water deficit only New Yorker growth slightly decreased. Plants were chilled to 2–5 °C during three consecutive, 16-h nights, preceded by warm days, which caused a decrease in the RWC of leaf blades. Chilling did not decreased leaf blade hydration significantly, but drastically increased the concentration of ABA in the xylem sap in more chilling tolerant cv. New Yorker only. The delivery rate of ABA was markedly enhanced in both cultivars, but much more in New Yorker. Drought hardening increased ABA delivery rate in cv. Robin only, especially after chilling. The lack of correlation between changes in the RWC of leaf blades after low temperature treatment and the concentration of ABA in the xylem sap as well as its delivery rate suggest, that in both tomato cultivars chilling increased ABA level directly, not as an secondery effect of temperature-induced water deficit.

The effect of nitrogen fertilization on growth rate of seedlings and yield of the tomato cultivars New Yorker and Szkarlatna Kula in field production

100%

Kolota E. , Biesiada A. , Adamczewska-Sowinska K.

tom 04

nr 2