Seleção de bactérias promotoras de crescimento no abacaxizeiro cultivar Vitória durante a aclimatização

Abstract

Olivares (4),(1) Parte da Tese de Doutorado da primeira autora. Recebido em junho de 2009 e aprovado em janeiro de 2010.

Diazotrophic bacteria and nitrogen fertilization on the growth of micropropagated pineapple plantlets during acclimatization

“…Micropropagated plantlets with higher SDW and RDW are more vigorous and may exhibit better adaptation in later phases, since the more developed the root system, the higher the nutrient uptake and plant growth. The observed RDW results are in accordance with BALDOTTO et al (2010) andWEBER et al (2003), who observed positive effects in micropropagated pineapple plantlets when inoculated with diazotrophic bacteria. However, it is important to note that while the effects of diazotrophic bacteria on plant growth and nutrition may be associated mainly with biological N fixation, other mechanisms may also be involved, such as the biosynthesis of indoleacetic acid (IAA) (BALDOTTO et al,2010).…”

“…Some studies have been performed with the goal of improving the acclimatization of pineapple plantlets or testing the effects of different acclimatization times (BERILLI et al, 2011), foliar fertilization (BREGONCI et al, 2008), or inoculation with diazotrophic bacteria, which has been observed to positively affect the adaptation of pineapple plantlets to changes environments (BALDOTTO et al, 2010).…”

“…However, N can also be supplied to plants via inoculation with diazotrophic bacteria. This strategy has become increasingly more common in agriculture (BALDOTTO et al, 2010) due to reductions in the use of N fertilizers, as observed in crops like soybeans (HUNGRIA et al, 2005) and sugarcane (BODDEY et al, 1995).…”

“…Therefore, several alternative methods, such as removal of apical meristems (SANTOS et al, 2011), propagation from stem cuttings (FREITAS et al, 2012), and micropropagation (BALDOTTO et al, 2010), have been investigated in order to minimize these problems.…”

“…Pineapple micropropagation produces healthy and homogeneous plantlets that can be used for the establishment of stocks, especially for new cultivars (BALDOTTO et al, 2010;MATOS et al, 2009). However, plantlets produced from in vitro cultures have to switch from heterotrophy to autotrophy and possess abnormal anatomical and physiological characteristics, such as under developed leaf cuticle and lower stomatal density, which necessitates acclimatization in order for them to cope with edaphoclimatic conditions (BARBOZA et al, 2006).…”