Teor e rendimento de flavonóides em calêndula (Calendula officinalis L.) cultivada com diferentes lâminas de irrigação

Abstract

Palavras-chave: Calendula officinalis, manejo da irrigação, tanque classe A ABSTRACT: Flavonoid content and yield in marigold plant (Calendula officinalis L.) cultivated under different irrigation depths.Calendula officinalis L. presents ornamental, culinary and therapeutic use. Its inflorescence is used to heal and as an anti-inflammatory. This study analyzed the effect of four different irrigation depths under field conditions on flavonoid production in marigold plant (Calendula officinalis L.). The water depths were estimated based on the class A pan evaporation (CPE): 0, 50, 100 and 150% CPE; they were applied from the beginning of flowering to the end of the culture cycle. There were no statistical differences in flavonoid content. The highest values of flower dry weight and flavonoid yield were obtained with the treatment without irrigation. The highest proline content was found in the plants subjected to overwatering stress. The accumulated water deficit for the treatment without irrigation signalized possible death due to water deficit. As precipitation occurred in the pre-flowering, the plant, originated from Mediterranean, responded with an abundant flowering in mass and number of flowers. Thus, for Presidente Prudente (São Paulo State, Brazil), if there is no water replacement through precipitation, supplementary irrigation with 200 mm will be necessary only in the pre-flowering to induce maximum flowering and maximum flavonoid yield per hectare.

Irrigation and organic fertilization on the production of essential oil and flavonoid in chamomile

“…The irrigation depth of 150% ETo associated with the organic fertilization using poultry manure at the dose of 5 kg m -2 (dose a2) led to the highest content of total flavonoids and yield of total flavonoids per plant. The results of content of total flavonoids were different from those obtained by Bortolo et al (2009) andPacheco et al (2011); according to these studies, the variation of water availability did not interfere with the concentration of this phenolic compound for the calendula crop. Mitchell et al (2007) found that the levels of flavonoids in tomato plants increase in the presence of organic fertilization.…”

Crescimento vegetativo, produção de fitomassa e de óleo essencial de Melissa officinalis L. sob diferentes lâminas de irrigação

“…Seu ciclo de vida varia de 90 dias, no verão, a 120 dias no inverno (LORENZI & MATOS, 2002e COUTO, 2006. A planta possui característica de plasticidade fenotípica sob altas temperaturas, em que acelera o desenvolvimento fenológico, a fi m de garantir a reprodução da espécie (BORTOLO et al, 2009). Apesar das adaptações da planta no local de origem, por questões climáticas, a melissa não fl oresce no Brasil (LORENZI & MATOS, 2002).…”

Prolina livre em alecrim-pimenta sob estresse hídrico antes da colheita

“…Os estudos avaliando o comportamento de plantas medicinais demonstram significativa influência do déficit hídrico tanto na produção como na formação de compostos tais como partenolíticos, flavonoides, óleos essenciais e alcaloides, (Penka, 1978, Carvalho et al, 2003, Castro et al, 2004, Bortolo et al, 2009.…”