TY  - JOUR
T1  - Photosynthetic Properties of Different Drought Resistant Chicory Strains and their Responses to Drought Stress
AU - Lu, Xinshi AU - Han, Yongfen AU - Li, Juan AU - Zhao, Xiangyong AU - Meng, Junjiang AU - Yang, Fei AU - Lu, Ruixia 
JO  - Journal of Animal and Veterinary Advances
VL  - 11
IS  - 21
SP  - 3898
EP  - 3907
PY  - 2012
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2012.3898.3907
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2012.3898.3907
KW  - Cichorium intybus L.
KW  -drought stress
KW  -photosynthesis
KW  -chlorophyll fluorescence
KW  -resistance
KW  -China
AB  - The photosynthetic properties and photosynthetic responses to drought stress in the pot experiment of three chicory (<I>Cichorium intybus</I> L.) strains with different drought resistance, space-mutagenesis-bred strains PA-82 and PA-43 and their initial strain PA-57 were studied using Li-6400 portable photosynthesis system. The results showed that diurnal time courses of net Photosynthetic rate (Pn), Transpiration rate (Tr), stomatal Conductance (Cond) presented as double-peak curves. There was an obvious midday Pn depression, which was caused by nonstomatal factors. Highest Pn, Tr and Cond values were observed in PA-82 and lowest corresponding values in PA-43 (p&lt;0.05). Intercellular CO<SUB>2</SUB> Concentration (Ci) of three strains showed an opposite course to that of Pn which reached its valley at 10:00-12:00. PA-82 had the highest Water Use Efficiency (WUE), followed by PA-57, then PA-43. Light Saturation Points (LSP) of three strains were between 1207-1264 &#956;mol<SUP>.</SUP>/m<SUP>2</SUP>/sec and Light Compensation Points (LCP) were between 14.55-14.85 &#956;mol/<SUP>.</SUP>m<SUP>2</SUP>/sec, both indicating good adaptation to changes of light intensity. Pn, Tr, Cond, maximal photochemical efficiency of PS II in dark adaptation (Fv/Fm), potential photochemical efficiency (Fv/F0) and coefficient of Photochemical quenching (qP) decreased with the aggravation of water deficit. Among the three strains, the parameters of PA-43 dropped to a greater extent at a highest speed, followed by PA-57 then PA-82. With the aggravation of water deficit, Ci and co-efficient of nonphotochemical quenching (qN) increased to a greater extent at a highest speed in PA-43. The results suggest that PA-82 and PA-57 have higher resistance against severe water deficit in comparison with PA-43.
ER  -