Indol-butyric acid levels on cashew cloning by air-layering process

Abstract

A study was conducted to determine the possibility of cashew (Anacardium occidentale) cloning by air-layering and influence of IBA (indol-butyric acid) on this process. It was adopted a completely randomized design with 4 treatments, 10 air layers each and 4 replications, reaching 160 air layers. The IBA levels on the treatments were, as follow: 0, 1000, 3000 and 5000 mg.kg-1. It was evaluated: survival, callus and rooting percentage, average number and length of roots. The highest survival rate (67.5%) was registered with no growth regulator and IBA at 1000 mg.kg-1, while the best rooting percentage (82%) referred to 1000 mg.kg-1. In spite of average number and length of roots, the highest results were observed with IBA at 5000 mg.kg-1. IBA concentrations had no influence on cashew air-layering formation.

Can auxins improve rooting of propagules and establishment of cashew clones?

“…Our data further supported Hartmann et al that IBA is the best auxin, with a wider concentration range than NAA, and is effective in promoting rooting of a large number of plant species [15]. Our results, however, differ from the opinion of Lopes et al [22] that IBA does not influence rooting in cashew. Conceivably, the low concentrations (0-0.5%) of IBA that were used could be responsible for the nonresponsiveness to IBA in that study.…”

Using Different Methods to Produce Vegetative Carob Seedlings

“…Higher rooting and survival percentage might be due to optimum IBA concentration may have caused mobilization and utilization of carbohydrates and nitrogen fraction with the presence of co-factor at wound site, which may have helped in better root initiation Chawla et al (2012). Also, Lopes et al (2005) et al (2012) and Das & Prasad (2014) on litchi they illustrated that the highest average number and length of roots were observed with highest concentration of IBA. These could be explained that accelerated rooting in air layering with the increased IBA concentration might be due to increased cell wall elasticity, which further may have accelerated cell division and in turn increased number of roots up to certain level.…”

Cashew crop propagation

“…Layering is a process that can also be used for cashew tree multiplication, and there is no need to use auxins for the occurrence of rooting for clone CCP 76, with rooting rates higher than 70%. However, further studies are needed to evaluate the survival rate of these seedlings after transplanting (LOPES et al, 2005). The clone used also influences the success of this process, as there is variation in the rooting capacity and also in the time for it to occur (ALIYU, 2007).…”