The present paper analyses the effect of pre-treatment with salicylic acid (SA) on germination and the growth of winter wheat seedlings in water stress conditions induced by polyetylene glycol (PEG). A two-factor experiment was conducted in a completely randomized projection. The first factor (A) included three levels: a1-distilled water -control; a2 -0.25 mM SA; a3 -0.75 mM SA and the second factor (B) included three levels: b1-distilled water; b2 -15% PEG and b3 -25% PEG. Biological material was represented by a DH winter wheat line. It were made observations on germination percentage (GP), root length (RL), cotyledons length (CL), seedling fresh weight (SFW) and vigor index (VI). After the analysis of the obtained results it can appreciate that the 25% PEG concentration played the main role for the significant decrease of the germination percentage (GP) and vigor index (VI). Also, seeds pre-treatment with 0.75 mM SA could be a way to improve germination characteristics in drought conditions.
Fertilizing wheat with nitrogen plays an important role in obtaining high yield and quality. In Romania’s environmental conditions, data regarding nitrogen fertilization are reported in various studies at different N levels. The aim of this research was to study the effect of different nitrogen doses on yield and quality of several new mutant/recombinant lines of winter wheat. Field trials were carried out in south of Romania during 2015-2017 in a rape-wheat rotation. The design of the yield trial was as complete randomised blocks with four replications and included two factors: A – three variants of fertilization (N0, N50 and N100) and B – genotype (line). At harvest, the number of grains per spike, grain weight/spike, thousand grain weight, grain yield and hectolitre weight were analysed. In variants fertilized with N100 the highest values for all studied parameters (yield – 5104.55 kg/ha; grains weight/spike – 3.35 g; TGW – 48.31g; HW – 78.76; number of grains/spike – 58.35) were registered. These results confirm good efficiency of N application. Principal component analysis revealed that seven variants, which had both positive components were fertilized with N100 and were all ranked in firsts seven position in the yield classification.
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