Kocheva Konstantina, Kartseva Tania, Nenova Veselina, Georgiev Georgi, Brestič Marián, Misheva Svetlana
Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bld. 21, 1113 Sofia, Bulgaria.
Department of Plant Physiology, Slovak Agricultural University, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia.
Physiol Mol Biol Plants. 2020 Nov;26(11):2139-2149. doi: 10.1007/s12298-020-00901-3. Epub 2020 Nov 7.
The performance of two contrasting Bulgarian wheat varieties (Slomer, an old tall cultivar, and Enola, a modern semi-dwarf one) to nitrogen deficiency was compared by measuring biochemical parameters characterizing N uptake and assimilation as well as growth and photosynthetic activity of young seedlings. The old genotype displayed better photosynthetic capacity, higher N assimilation expressed by elevated amino acid synthesis and better overall performance under N limitation. This could be explained by the fact that selection of old varieties was performed mostly in environments with low nutrient availability and consequently these genotypes proved to be more suitable for growing on low-input conditions. Upon limiting N supply modern variety preferentially accumulated sugars while the old one retained higher amino acids levels. It was demonstrated that processes involved in N metabolism were tightly interrelated with photochemical reactions and carbon assimilation even at early developmental stage.
通过测量表征氮素吸收和同化的生化参数以及幼苗的生长和光合活性，比较了两个截然不同的保加利亚小麦品种（老的高秆品种斯洛默和现代半矮秆品种伊诺拉）对氮素缺乏的表现。老基因型表现出更好的光合能力、更高的氮同化能力（以氨基酸合成增加来表示）以及在氮限制条件下更好的整体表现。这可以通过以下事实来解释，即老品种的选育大多是在养分供应低的环境中进行的，因此这些基因型被证明更适合在低投入条件下生长。在限制氮供应时，现代品种优先积累糖分，而老品种则保持较高的氨基酸水平。结果表明，即使在发育早期，氮代谢过程也与光化学反应和碳同化紧密相关。
