Abstract
This study aimed at determining the responses of some of the growth parameters of Lycopersicum esculentum to light and nutrient stress. The focus is equally orientated in determining the effect of light and nutrient stress on the photosynthetic pigment accumulation in plants. Tomato seeds were grown in pretreated sand and were watered with distilled water until the experimental culture was fully established. After this, the plants were transplanted into 60 plastic pots, with holes bored at the bottom to allow proper drainage of the excess water during the course of the experiment. The plants were divided into four groups of fifteen pots each. A group of plants was submitted to stress of nutrient lack by only administering 100 ml of complete nutrient solution, once every four days. The nutrient solution if applied daily was considered to be adequate for the plants. Another group of plants was lightly stressed, by placing them under shade, while adequate light was gotten in direct sunlight. Sampling was carried out at weekly intervals, starting from the seventh day after the first treatment. Plants were randomly picked from each of the four treatments. Three replicates were used for each parameter. The results showed that there was a reduction in photosynthetic pigment accumulation in the plants when both light and nutrient were limited. The data obtained from the study were first tested between normality and assumption of constant variance. A two-way analysis of variance (ANOVA) was carried out considering both factors (light and nutrient ) as source's of variation to investigate the effects of full light and full nutrient (FLFN ), full light and partial nutrient (FLPN), partial light and full nutrient (PLFN) and partial light and partial nutrient (PLPN) the parameters studied in Lycopersicum esculentum.
Highlights
Crop plants are often exposed to various environmental stresses which severely affect soil productivity and crop production, worldwide. Bray et al (2000) estimated that the contribution of environmental stress factors to loss of food production was becoming increasingly important
Since the work was on the effect of nutrient and light, sand was used for the germination of the seedlings because it does not contain any mineral element except for the SiO2 that is present in it
Plants in group 3 and 4 were placed under a shade provided by the Tecoma stans tree with group 3 plants receiving 100 ml of complete nutrient solution everyday while plants in group 4 were given 100 ml of complete nutrient solution once in four days (Adelusi and Aileme, 2006)
Summary
Crop plants are often exposed to various environmental stresses which severely affect soil productivity and crop production, worldwide. Bray et al (2000) estimated that the contribution of environmental stress factors to loss of food production was becoming increasingly important. Crop plants are often exposed to various environmental stresses which severely affect soil productivity and crop production, worldwide. Bray et al (2000) estimated that the contribution of environmental stress factors to loss of food production was becoming increasingly important. Survival and productivity of crop plants exposed to environmental stresses are dependent on their ability to develop adaptive mechanisms to avoid or tolerate stress. Accumulating evidence suggests that the mineral nutritional status of plants greatly affects their ability to adapt to adverse environmental conditions Impairment of the mineral nutrition of plants can, be accompanied by an enhanced potential for photo-oxidative damage and this threat can be especially serious when plants are simultaneously exposed to an environmental stress
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