Acta Botanica Croatica, Vol. 39 No. 1, 1980.
Izvorni znanstveni članak
The Effect of Lead on the Structure and Function of Wheat Plastids
Mercedes Wrischer
; Hrvatska
Darinka Meglaj
; Hrvatska
Sažetak
The effect of lead salts on the structure and function of plastids in etiolated and green wheat leaves exposed to light has been studied by ultrastructural investigations, pigment analysis and determination of pho- tosynthetic activity (O2, exchange).
The investigations have shown that in plastids of etiolated leaves, after they were exposed to light, the development of new thylakoids and the synthesis of pigments, especially of chlorophyll are strongly affected by lead salts (PbCl, or Pb(N03)2 at concentration of 1 mM or 5 mM). In relation to their low chlorophyll content, the photosynthetic activity (both the Hill reaction, and the activity of photosystem 1) in these plastids is rather high. This indicates that lead inhibits the normal differentiation of plastids so that they remain in their early etiochloroplast developmental stage.
There are no prominent ultrastructural changes in the chloroplasts of green leaves held on lead solutions, although their chlorophyll content and photosynthetic activity are lower than in chloroplasts of untreated leaves. It has been shown that, when isolated chloroplasts are treated with lead salts, photosystem 1 is less affected than the Hill reaction.
Some other ultrastructural changes found in leaves held on lead solutions are also described.
Ključne riječi
Hrčak ID:
158363
URI
Datum izdavanja:
31.12.1980.
Posjeta: 882 *