Odziv mladih kumar na diurnalni upad temperature v različnih obdobjih dneva in noči

Tatjana G. SHIBAEVA, Elena G. SHERUDILO, Elena N. IKKONEN, Alexander F. TITOV

Povzetek


Pri pridelavi različne zelenjave in okrasnih rastlin v rastlinjakih se pogosto uporablja kratkotrajno znižanje temperature proti koncu noči ali proti jutru za zmanjšanje podaljševanja stebla kot alternativa kemijskim rastnim zaviralcem. Izvedeni so bili poskusi za ovrednotenje učinkov znižanja temperature na rast in fotosintetsko aktivnost mladih kumar v različnih obdobjih dneva in noči. V obdobju šestih dni so bile rastline izpostavljene temperaturi 10 °C za 2 h na začetku, v sredini in ob koncu noči, ter podnevi. Rezultati so pokazali, da je odziv na znižanje temperature kvalitativno različen v svetlobi in v temi. Čeprav je bil največji učinek znižanja zabeležen ob tretmanu podnevi, je iz praktičnih razlogov za uporabo v rastlinjakih primernejše znižanje ponoči. Kljub temu, pa pri sadikah kumar ni nujno izvajati znižanje proti koncu noči kot navaja literatura. Na osnovi naših rezulatov lahko dvomimo o naslednjih trditvah: (a) znižanja temperature so neučinkovita, če so izvedena v drugih obdobjih dneva ali noči, razen pred sončnim vzhodom, (b) optimalni čas za učinke znižanja je odvisen od dnevne dinamike dolžinske rasti stebla in listnih pecljev. Obratno, že samo znižanje temperature je sposobno spremeniti dinamiko rasti rastlin v dnevnem ciklu.

Ključne besede


Cucumis sativus L.; rast; dnevni ritmi

Celotno besedilo:

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Literatura


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DOI: http://dx.doi.org/10.14720/aas.2018.111.3.05

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