Effect of Zn2+ stress in rice (Oryza sativa cv. Manhar) on growth and photosynthetic processes

Title:

Effect of Zn2+ stress in rice (Oryza sativa cv. Manhar) on growth and photosynthetic processes

Creator:

Ajay and Rathore, V.S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b6fe87e5-a9f4-4aef-999b-8d50b4691ab2
uuid:b6fe87e5-a9f4-4aef-999b-8d50b4691ab2
urnnbn:urn:nbn:cz:aba007-000fpf

Subject:

carotenoids, thylakoids, sugars, starch, relative growth rate, photosynthates, Hill reaction, cyclic and non-cyclic photophosphorylation, and chlorophyll

Type:

model:internalpart and TEXT

Format:

print

Description:

Effect of three Zn2+ concentrations, i.e. 0.075 (cl), 7.50 (c2) and 37.5 (c3) jiM, on rice seedlings was studied at three stages, i.e. 1, 14 and 21 d after transplantation. Typical deficiency symptoms were observed in both solution and sand cultures of cl and c2, but the effects were more pronounced in the solution culture. The c3 concentration was toxic. There was marked reduction in growth, chlorophyll (Chl) contents (particularly Chl b), Hill reaction activity, photophosphorylation rate (particularly non-cyclic photophosphorylation), thylakoid phosphorylation, and i'‘C02-fixation at the cl concentration. However, a similar reduction was also observed in thylakoid phosphorylation at the c3 concentration. Hence the optimum zinc concentration in the nutrient medium lied between c2 and c3 Zn2+. By regression the theoretical optimum Zn concentration was calculated as 19.20 pM (1.28 mg kg'i) Zn2+. Partitioning of ^'^C-photosynthates indicated reduced allocation to sugar and starch fractions and increased fřee amino acids concentration at the cl concentration and vice-versa at c2 and c3.

Language:

Multiple languages

Rights:

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

Coverage:

571-584 and 93-106

Source:

Photosynthetica | 1995 Volume:31 | Number:4

Harvested from:

CDK

Metadata only:

false