Influence of nitrogen and potassium fertilizers on pectic enzyme activity in tomato fruit

1963 ◽  
Vol 14 (8) ◽  
pp. 550-554 ◽  
Author(s):  
G. E. Hobson
Keyword(s):  
Enzyme Activity ◽  
Tomato Fruit ◽  
Pectic Enzyme

Role of pectic and cellulolytic enzymes in the invasion of the soybean by Rhizobium japonicum

1975 ◽  
Vol 21 (8) ◽  
pp. 1254-1258 ◽  
Author(s):  
William J. Hunter ◽  
Gerald H. Elkan
Keyword(s):  
Enzyme Activity ◽  
Indoleacetic Acid ◽  
Methyl Cellulose ◽  
Rhizobium Japonicum ◽  
Cellulolytic Enzymes ◽  
Pectic Acid ◽  
Pectic Enzyme ◽  
Seedling Inoculation

Past workers have suggested pectic enzyme involvement in the invasion of legumes by Rhizobium. However, no role for pectic acid, pectin, or methyl cellulose depolymerase enzymes in the invasion of R. japonicum was suggested by the current study. Seedling inoculation with infective bacteria did not result in increased enzyme activity. Rhizobium japonicum cell-free culture extracts and 3-indoleacetic acid did not affect the activation, induction, or binding of these enzymes.

Temporally extended gene expression of the ADP-Glc pyrophosphorylase large subunit (AgpL1) leads to increased enzyme activity in developing tomato fruit

Planta ◽  
2006 ◽  
Vol 224 (6) ◽  
pp. 1465-1479 ◽  
Author(s):  
Marina Petreikov ◽  
Shmuel Shen ◽  
Yelena Yeselson ◽  
Ilan Levin ◽  
Moshe Bar ◽  
...  
Keyword(s):  
Gene Expression ◽  
Enzyme Activity ◽  
Large Subunit ◽  
Tomato Fruit

scholarly journals The Associated With Carbon Conversion Rate and Source–Sink Enzyme Activity in Tomato Fruit Subjected to Water Stress and Potassium Application

2021 ◽  
Vol 12 ◽  
Author(s):  
Anrong Luo ◽  
Chenni Zhou ◽  
Jinliang Chen
Keyword(s):  
Enzyme Activity ◽  
Water Stress ◽  
Carbon Metabolism ◽  
Conversion Rate ◽  
Carbon Allocation ◽  
Higher Plants ◽  
Relative Rate ◽  
Tomato Fruit ◽  
Carbon Accumulation ◽  
Carbon Conversion

Carbon metabolism in higher plants is a basic physiological metabolism, and carbon allocation and conversion require the activity of various enzymes in metabolic processes that alter the content and overall composition of sugars in the sink organ. However, it is not known how various enzymes affect carbon metabolism when tomato plants are subjected to water stress or treated with potassium. Although the process of carbon metabolism is very complex, we used the carbon conversion rate to compare and analyze the enzyme activities related to sugar metabolism and find out which carbon conversion rate are the most important. Results showed that water stress and potassium increased carbon import flux in the fruit, which was beneficial to carbon accumulation. Water deficit increased the activity of sucrose synthase (SuSy) and starch phosphorylase (SP) and decreased the activity of sucrose phosphate synthase (SPS) and adenosine diphosphate glucose pyrophosphorylase (AGPase) in the source. Water stress increased the activity of acid invertase (AI), SuSy and SP but decreased the activity of AGPase in the sink. Potassium modified the balance of enzymes active in sugar and starch metabolism by increasing the activity of AI, SuSy, SPS and SP and significantly decreasing the activity of AGPase, resulting in increase of hexose. Canonical correlational analysis revealed that the carbon conversion rate was mainly affected by the relative rate of conversion of sucrose to fructose and glucose [p1(t)] and glucose to starch [p5m(t)]. SuSy and AGPase had the greatest effect on enzyme activity in the fruit; respectively regulated p1(t) and p5m(t).

Polygalacturonase in Tomato Fruits and the Induction of Ripening

1982 ◽  
Vol 9 (2) ◽  
pp. 171 ◽  
Author(s):  
CJ Brady ◽  
G Macalpine ◽  
WB McGlasson ◽  
Y Veda
Keyword(s):  
Molecular Weight ◽  
Enzyme Activity ◽  
Tomato Fruit ◽  
Water Soluble ◽  
Enzyme Protein ◽  
Tomato Fruits ◽  
High Molecular Weight Form ◽  
Fruit Samples ◽  
Highly Correlated ◽  
Molecular Weight Form

Endopolygalacturonase (EC 3.2.1.15) activity, endopolygalacturonase protein detected immunologically and water-soluble uronide were measured in tomato fruit samples (cv. Rutgers) at different stages of ripening. Endopolygalacturonase activity and endopolygalacturonase protein were only detected in samples in which ripening had been initiated for 2 or more days. Enzyme activity and enzyme protein increased during ripening and were highly correlated. A high molecular weight form of the enzyme appeared 2 or 3 days after ripening was initiated. Lower molecular weight forms of endopolygalacturonase appeared later and eventually accounted for most of the enzyme protein. The content of water-soluble uronide did not increase until fruit had been ripening for 4 or more days. It is concluded that endopolygalacturonase is not involved in the initiation of ripening.

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