GENOTYPIC DIFFERENCES IN DIFFERENT PH LEVELS IN RELATION TO GROWTH AND MORPHOLOGY OF VARIOUS GOURD GENOTYPES AND WATERMELON CULTIVARS


Ulas F., YETİŞİR H. , ULAŞ A.

COST ACTION FA 1204 2nd COST Action FA1204 ANNUAL CONFERENCE - INNOVATION IN VEGETABLE GRAFTING FOR SUSTAINABILITY, Carcavelos, Portugal, 20 - 22 October 2014, no.1, pp.16

  • Publication Type: Conference Paper / Summary Text
  • City: Carcavelos
  • Country: Portugal
  • Page Numbers: pp.16

Abstract

A plant’s ability to endure various pH levels depends largely on it’s ability to take in and
utilize nutrients at varying concentrations in the soil solution. Some plants prefer, even
require, acid soils and are not bothered by the lack of nutrients. Other plants will tolerate,
but do not require, pH levels above 7, and are adapted to the lack of micronutrients. The
“ideal” soil pH is close to neutral, and neutral soils are considered to fall within a range from
a slightly acidic pH of 6.5 to slightly alkaline pH of 7.5. It has been determined that most
plant nutrients are optimally available to plants within this 6.5 to 7.5 pH range, plus this
range of pH is generally very compatible to plant root growth. The aim of the study was to
screen for the genotypic differences in different pH levels in relation to growth and
morphology of various gourd genotypes and watermelon cultivars under greenhouse
conditions. Two watermelon cultivars (Crimson Tide, Crisby) and 20 different gourd
(Lagenaria siceraria landraces Cucurbita maxima) genotypes were grown in 8 L pots filled
continuously aerated nutrient solution under three different pH levels (8.5, 6.5 and 4.5) with
three replications. The results indicated that shoot (stem and leaf fresh and dry matter, leaf
area) and root (root fresh and dry matter, root length) growth significantly (P<0.001)
affected by different levels of pH supply. Highly significant (P<0.001) genotypic variation in
shoot and root growth was found among genotypes and cultivars. Growth response to
supplied pH, i.e. the interaction between pH and genotype, was also highly significant
(P<0.001) in some shoot and root growth parameters.