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Articles by G.W. Netondo
Total Records ( 5 ) for G.W. Netondo
  E. Luvaha , G.W. Netondo and G. Ouma
  Six month old Mango (Mangifera indica L.) rootstock seedlings were grown in 20 L plastic pots in a greenhouse at Maseno University, Kenya. to investigate the effect of water deficit on its morphological and physiological characteristics such as plant height, number of leaves, stem diameter and gas exchange characteristics and chlorophyll content, respectively. A Completely Randomized Design (CRD) with four treatments and six replications was used. The treatments involved subjecting the rootstock seedlings to four different irrigation regimes namely watering daily, twice in a week, once in a week and once in two weeks. The measurements were taken after every two weeks for a period of three months. At the end of the experiment, destructive sampling to establish the root to shoot ratio were taken. The soil moisture content under the different irrigation regimes was also determined gravimetrically. Growth parameters increased under mild water stress except under extreme water deficit where there was wilting. Root to shoot ratio increased with increasing water deficit. Increase in water deficit reduced the gas exchange parameters but slightly increased chlorophyll content. It is concluded that water deficit significantly (p≤0.05) affects physiological and morphological characteristics of Mango.
  E. Luvaha , G.W. Netondo and G. Ouma
  D.M. Musyimi , G.W. Netondo and G. Ouma
  Elizabeth Luvaha , G.W. Netondo and G. Ouma
  The present studies were aimed at investigating the effect of different watering regimes on the gas exchange parameters (stomatal conductance, CO2 assimilation and transpiration rates) and chlorophyll content of young Mango (Mangifera indica) rootstock seedlings. The hypothesis was that different levels of water deficit affect the gas exchange parameters and chlorophyll content of the mango rootstock seedlings. Six-month-old Mango (Mangifera indica L.) rootstock seedlings were grown in polythene pots in a greenhouse at Maseno University, Kenya from December 2003 to March 2004 and subjects to four different watering regimes (namely daily, twice in a week, once in a week and once in two weeks). These treatments were in a Completely Randomized Design (CRD) with six replications. The parameters determined were stomatal conductance, transpiration rate, CO2 assimilation rate and intercellular CO2 concentration. All the gas exchange parameters were determined by infra Red Gas Analyser (PP systems). The results showed that increasing water stress reduced the physiological parameters particularly at the later days of plant growth due to stomatal and non-stomatal factors. Leaf chlorophyll content however was slightly increased since the chlorophyll pigments may have been resistant to dehydration. It is concluded that increase in water stress (increasing level of water deficit) reduces the gas exchange parameters of mango (Mangifera indica) rootstock seedlings but slightly increased chlorophyll content due to an adaptive mechanism.
  D.M. Musyimi , G.W. Netondo and G. Ouma
  This study was conducted to investigate growth and gas exchange characteristics of avocado seedlings growing under different salinity levels under naturally illuminated greenhouse conditions, in order to relate this physiological information to the ecology of this avocado cultivar. Plants grown in 4.5 L plastic pots containing soil were subjected to 0 (control), 15, 30, 45 and 60 mM NaCl salinity treatments. The measured parameters started to show significant differences (p≤0.05) by day 7. Interactions between salt treatments and duration of salt exposure were highly significant at p≤0.05. Net photosynthetic rate (PN), stomatal conductance (gs), transpiration rate (E) and chlorophyll (chl) concentration decreased in response to increasing salt concentration in the growth medium. Water use efficiency (WUE) decreased in all the treatments during the time course of experiment. Substomatal CO2 concentration (Ci) and chloride ions content increased with increasing salt concentration of the growth medium. It is suggested that the greater inhibition of CO2 fixation may be due to impairment of photosynthetic apparatus. Treatment consisting of 60 mM NaCl caused maximum growth reductions. The findings in this study demonstrate that NaCl salinity hampers growth and gas exchange processes of avocado plants and improvement in salt resistance of avocado rootstock under study is more likely to come from increasing further screening of more avocado rootstocks for salt tolerance or resistance.
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