|Table of Contents|

Effects of Interaction Between Light Intensity and Substrate Moisture on Growth and Carbon Metabolism of Processing Tomato Seedlings

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2022年01
Page:
9-15
Research Field:
Publishing date:

Info

Title:
Effects of Interaction Between Light Intensity and Substrate Moisture on Growth and Carbon Metabolism of Processing Tomato Seedlings
Author(s):
SUN Shijun1; HAO Shuiyuan1; 2; LAI Liming1; CHEN Long1; LIU Ye1
(1.Department of Agronomy,Hetao University,Bayannaoer,Inner Mongolia 015000；2.Key Laboratory of Inner Mongolia Education Department,Bayannaoer,Inner Mongolia 015000)
Keywords:
processing tomato; light intensity; substrate moisture; growth; carbon metabolism
PACS:
-
DOI:
10.11937/bfyy.20211261
Abstract:
Taking processing tomato cultivar ‘Tunhe No.9’ as the test material,the potted with solid substrate method was carried out,the effects of different substrate moisture (80%,70% and 60% of the maximum water holding capacity) on growth morphology and photosynthetic parameters of processing tomato seedlings under 500 μmol·m-2·s-1,300 μmol·m-2·s-1and 100 μmol·m-2·s-1light intensities were studied,in order to achieve the purpose of cultivating strong seelding.The results showed that,when the light intensity was 500 μmol·m-2·s-1,the plant height,leaf area and whole plant dry weight of processing tomato seedlings treated with GG were significantly higher than those of GZ and GD,the plant height,leaf area,dry weight of whole plant and stem diameter of GD treatment were the lowest,and the root shoot ratio was the highest.With the decrease of substrate water content,the net photosynthetic rate (Pn),transpiration rate (Tr),and stomatal conductance (Gs) of processed tomato showed a significant decrease trend,and the intercellular carbon dioxide concentration showed a significant increase trend.There were significant differences in synthetase and sucrose synthase,and GG>GZ>GD.The total sugar,sucrose,fructose and starch content of GG treatment are significantly higher than that of GZ and GD treatments.With the decrease of light intensity,the growth of processing tomato seedlings was inhibited,photosynthesis decreased,and the activities and products of key enzymes of carbon metabolism decreased.When the light intensity was 300 μmol·m-2·s-1and 100 μmol·m-2·s-1,the substrate moisture was controlled at 70% and 60% of the maximum water capacity of the substrate under the same light intensity,respectively,which was conducive to the growth and carbon metabolism of processing tomato seedlings.In conclusion,when the light intensity was 500 μmol·m-2·s-1 and the substrate moisture was 80% of the maximum water holding capacity of the substrate,it was the most suitable for the growth of processing tomato seedlings.When the light intensity was reduced,appropriate control of the water content of the substrate could enhance the weak light tolerance of plants.

References:

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Last Update: 2022-03-30