XVI International Botanical Congess
Linear growth in the cultivated (Triticum monococcum L., T.dicoccum Schuebl.,T.aestivum L.) and wild (T.uartu Thum.ex Gandil.,T.dicoccoides Koern) wheat has been investigated in the field conditions of Armenia by the method of auxanography. The daily periodicity of wheat linear growth is characterized by a curve closely represented by a sinusoid with the maximum growth rate in the day-time hours (12:00 pm to 2:00 pm) and the minimum in the early morning hours (6:00 am to 8:00 am). Wheat growth daily periodicity is determined by both endogenic and exogenic growth factors. The leading role among them belongs to the termoperiodicity. The number of characteristics connected with plant resistance, causing their higher degree of stability, and resulting in wider adaptation to abiotic factors and unfavorable environmental conditions has been demonstrated in wild wheat in comparison with cultivated species.