Utilization of photosynthetically fixed 14CO2 into alkaloids in relation to primary metabolites in developing leaves of Catharanthus roseus

Title:

Utilization of photosynthetically fixed 14CO2 into alkaloids in relation to primary metabolites in developing leaves of Catharanthus roseus

Creator:

Srivastava, N. K., Misra, A., Srivastava, A. K., and Sharma, S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:6995cfd6-2cd3-4e9b-930c-04d543862633
uuid:6995cfd6-2cd3-4e9b-930c-04d543862633
issn:0300-3604
doi:10.1023/B:PHOT.0000046168.97328.a6

Subject:

amino acids, chlorophyll, leaf area and dry mass, leaf ontogeny, net photosynthetic rate, organic acids, sugars, terpenoids, and total alkaloids

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Partitioning of current photosynthates towards primary metabolites and its simultaneous incorporation in leaf alkaloids was investigated in developing leaves of medicinally important Catharanthus roseus. Of the total 14CO2 assimilated, the leaves at positions 1-6 fixed 8, 22, 25, 19, 13, and 8 %, respectively, and stem 3 %. Leaf fresh mass, chlorophyll content, and CO2 exchange rate increased up to the third leaf. The total alkaloid content was highest in young actively growing leaves, which declined with age. Total 14C fixed and its content in ethanol soluble fraction increased up to the third leaf and then declined. The 14C content in primary metabolites such as sugars and organic acids was also highest in the 3rd leaf. The utilization of 14C assimilates into alkaloids was maximum in youngest leaf which declined with leaf age. Hence the capacity to synthesize alkaloids was highest in young growing leaves and metabolites from photosynthetic pathway were most efficiently utilized and incorporated into alkaloid biosynthetic pathway by young growing leaves. and N. K. Srivastava ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

469-472

Source:

Photosynthetica | 2004 Volume:42 | Number:3

Harvested from:

CDK

Metadata only:

false