Abstract
To study the effects of the reciprocal grafting on the photosynthesis of two genotypes tomato offspring under selenium stress, red ball cherry tomato cherry 5-5-1 and yellow ball cherry tomato yellow RTY-3-2 post-grafting generation (red scion, red rootstock, yellow scion and yellow rootstock) and seedlings (red CK and yellow CK) planted in 10 mg·kg-1 selenium soil, and the pot experiment was carried out to study the effects of the reciprocal grafting on the growth characteristics and the photosynthesis of tomato offspring under selenium stress. The results showed that grafting increased the fresh weight of the organs of the offspring, the ratio of root to shoot, and the functional activity of the roots of the plants, which was conducive to the growth of tomato offspring. Simultaneously, it could effectively improve the photosynthetic capacity of grafted offspring leaves at the seedling stage. The grafted offspring of rootstocks had the best effect on improving the net photosynthetic rate, stomatal conductance and transpiration rate and stomatal conductance of tomato leaves, and decreased intercellular CO2 concentration. Among them, the best effect of yellow rootstock was to provide ideas and theoretical basis for the production of selenium-enriched tomatoes in the selenium-deficient areas in the future.
Highlights
Tomato (Solanum Lycopersicon L.) is an annual or perennial herb of Solanum in Solanaceae, which is rich in nutrient
There was no significant difference between yellow scion and yellow rootstock, but they were significantly higher than the control group, respectively than yellow CK 12.3% and 23.1% higher
Root length, stem base diameter, and fresh weight of roots and leaves are the targets of plant growth vigor [10]
Summary
Tomato (Solanum Lycopersicon L.) is an annual or perennial herb of Solanum in Solanaceae, which is rich in nutrient. It is an important vegetable widely cultivated and occupies an important position in the annual supply of vegetables [1]. Se has a dual effect on the growth and development of plants. In low concentration, it promoted growth, in high concentration, it inhibited growth, and in excess, it caused toxicity [2]. When the concentration of Se in the solution was lower than 0.1 mg·L-1, Se promoted the growth of tomato seedlings, showed the best growth when 0.05 mg·L-1, and inhibited the growth of tomato seedlings when it was higher than 0.5 mg·L-1. When the spraying concentration exceeded 1500 mg·L-1, symptoms of Se poisoning were observed, resulting in decreased yield and quality [4]
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