ABSTRACT
Plant trichomes are special structures that originate from epidermal outgrowths. Trichomes play an important role in plant defense against pests and diseases, and possess economic and medicinal values. Study on molecular mechanism of plant trichomes will contribute to the molecular design breeding and genetic improvement of crops. In recent years, the regulation mechanism of trichome development has been basically clarified in the model plant Arabidopsis thaliana, while great progresses are also found in other plant species. In this review, we focus on the developmental regulation of trichome formation from gene and phytohormones levels in Arabidopsis and cotton (with unicellular trichomes), as well as in tomato and Artemisia annua (with multicellular trichomes). The research progress associated with trichomes is also introduced in other typical monocotyledons and dicotyledons. Finally, the research and application of plant trichomes are prospected.
Subject(s)
Arabidopsis/genetics , Gene Expression Regulation, Plant , Gossypium/genetics , Solanum lycopersicum , Plant Growth Regulators/metabolism , Trichomes/geneticsABSTRACT
RESUMO A pesquisa objetivou investigar preditores da qualidade de vida (QV) de pessoas vivendo com HIV/aids (PVHA), baseada no modelo de autorregulação de Leventhal, no qual a influência da percepção da doença na QV é mediada por estratégias de enfrentamento. Foram 95 PVHA a responder aos instrumentos Brief IPQ, Brief Cope e WHOQOL-HIV Bref relativos, respectivamente, à percepção da doença, estratégias de enfrentamento e QV. Os resultados indicaram que a percepção da doença teve efeito direto e indireto na QV, mediado por estratégias de enfrentamento. Maior percepção de ameaça da doença associou-se à pior QV percebida; porém, o uso mais frequente das estratégias aceitação, distração e suporte instrumental e a menor utilização de desengajamento comportamental e de reinterpretação positiva amenizaram esse efeito negativo.
ABSTRACT This study aims to investigate the quality of life (QOL) predictors of people living with HIV/AIDS (PLWHA), from the perspective of Leventhal’s Self-Regulation Model, in which the influence of the illness perception on QOL is mediated by coping strategies. Ninety-five PLWHA answered to the instruments Brief IPQ, Brief Cope and WHOQOL-HIV BREF concerning, respectively, illness perception, coping strategies and QOL. The results indicate that illness perception has direct and indirect effects in QOL, mediated by coping strategies. The more HIV is perceived as threatening, the worse is the perception of QOL of PLWHA; however, the increased use of acceptance, distraction and instrumental support coping strategies and the less use of behavioral disengagement and positive reinterpretation could mitigate this negative effect.