Changes in photosynthetic attributes related to genetic improvement of cotton yield were studied in seven Chinese cotton cultivars widely grown in Xinjiang during the past 30 years. Our results showed that a chlorophyll (Chl) content and net photosynthetic rate (PN) of the 1980s cultivar was the highest among all after 60 days from planting (DAP). However, after 75 DAP, the Chl content, PN, and actual photochemical efficiency of PSII of the old cultivars declined gradually, whereas those of the new cultivars remained relatively high. Compared to the old cultivars, leaves of the new cultivars endured a longer period and their senescence was slower, shoot and boll dry mass was higher, but the root to shoot ratio was lower. The lint yield of the 2000s cultivars was 14.7 and 21.4% higher than that of 1990s and 1980s cultivars, respectively. The high yield of the new cultivars was attributed to a greater number of bolls per unit of area with high lint percentage. We suggested that the improved photosynthetic capacity and the increased ability to deliver photosynthates to reproductive sites during the peak boll-setting stage to boll-opening stage were the key physiological basis in the evolution process of cotton cultivars from 1980s to 2000s for the cotton yield improvement within a short growing period., H. H. Luo, H. L. Zhang, Y. L. Zhang, W. F. Zhang., and Obsahuje bibliografii
We prove L2-maximal regularity of the linear non-autonomous evolutionary Cauchy problem \dot u(t) + A(t)u(t) = f(t){\text{ for a}}{\text{.e}}{\text{. }}t \in \left[ {0,T} \right],{\text{ }}u(0) = {u_0}, where the operator A(t) arises from a time depending sesquilinear form a(t, ·, ·) on a Hilbert space H with constant domain V. We prove the maximal regularity in H when these forms are time Lipschitz continuous. We proceed by approximating the problem using the frozen coefficient method developed by El-Mennaoui, Keyantuo, Laasri (2011), El-Mennaoui, Laasri (2013), and Laasri (2012). As a consequence, we obtain an invariance criterion for convex and closed sets of H., Ahmed Sani, Hafida Laasri., and Obsahuje seznam literatury
In the phylogenetic history of photosynthesis the C4 photosynthetic pathway is a rather latě, a nearly recent event. With the background of globál CO2 starvation and given the evolutionary competence, different ecological constraints as water and/or nitrogen deficiency oř salinity could be the driving forces in distinct habitats for selection of genotypes with a CO2 pump. Whether C3-like C3-C4 intermediate species BLS Moricandia arvensis with a less efficient CO2 pump are on the way to C4 photosynthesis remains an open question. Selection for a somewhat improved CO2 concentration mechanism under strong selective pressure seems to be a possible experimental approach to imitate evolutionary steps in adaptation to CO2 starvation.
The study dealt with the problem of the other European identity as reflected in the English travel writing of the seventeenth century. The crucial question was if any coherent whole, in cultural terms, was distinguished on the mental map of the 17th century English traveller in the area of “Trans-Rhenic Europe”. The mental map was understood here as a sort of image which is not related to sensory experience. It is considered as Creative construction of unknown based on what was read, what was heard, and on past experience. The viewpoints defining units and drawing borders were of cultural character. Firstly, it was interested in traveller’s division of known and unknown Europe. Secondly, it was looking for the borders of learned part of Europe drawn on the traveller’s mental map. Thirdly, it was focused on characteristics of people given by travellers. Finally, the borders of “civilization” and “barbarism” on the mental map of a 17th century traveller were questioned.
Evropa se nachází pod tlakem silné imigrace. Nejde přitom o nic nového, v pravěku docházelo k migracím poměrně často a lze říci, že z dnešního pohledu náš genofond spíše obohatily. Pro budoucí identitu příchozích je podstatné, jak se k nim budeme nyní chovat, protože identita se vytváří vždy v interakcích., Europe is under a relatively strong immigration pressure. However, this is nothing new; prehistoric migrations occurred quite often and we can retrospectively summarize they rather enriched our gene pool. Since the identity of immigrants is always created in interactions, it is essential how we treat these people right now., and Viktor Černý, Martin Hájek.
15 years ago a small group of the Czech scientists visited the meeting of European plant exophysiologists in Viterbo starting a new EU projects on elevated CO2 effects. Because of personal involvement of prof. Paul Jarvis, the Czech group was incorporated into this type of European ecophysiological research. On the occasion of the 15th anniversary was prepared a conference covering the topics from stress physiology and elevated CO2 effects from leaves to ecosystems up to impact of climate change on ecosystems. Key findings in regulatory and stress physiology, plant-to-plant interactions and responses to changing environment with emphases on single and/or combined effects of CO2, water and temperature were presented. and Michal Marek.