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EFFECTS OF SEEDING DEPTH ON SUBCROWN INTERNODE ELONGATION AND GRAIN YIELD IN WHEAT

文献类型： 外文期刊

作者： Kong, Lingan 1 ; Sun, Mingze 1 ; Wang, Fahong 1 ;

作者机构： 1.Shandong Acad Agr Sci, Crop Res Inst, 202 Gongyebei Rd, Jinan 250100, Peoples R China

2.Plant Protect Stn Liaocheng City, Liaocheng 252000, Peoples R China

关键词： Hormone;seeding depth;subcrown internode;ultrastructure;wheat

期刊名称：PAKISTAN JOURNAL OF AGRICULTURAL SCIENCES （ 影响因子：0.748； 五年影响因子：0.854 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Successful stand establishment is prerequisite for optimum crop yields and can be affected by seeding depth. A field experiment was conducted to investigate the effects of seeding depth on agronomical characteristics, structural feature of subcrown internode (SCI), plant growth and ultimately grain yield of winter wheat. Seeds of Luyuan 502 were sown at four seeding depths (10, 25, 40 and 55 mm). The results showed that increasing the seeding depth from 10 to 40 mm increased seedling emergence rate, numbers of fall tillers per unit area and per plant. Seeding at 55-mm depth significantly decreased the seedling emergence, tillering capacity, spikes per unit m(2); however, the fertile tiller percentage significantly increased compared with shallower seeding. At 10-mm soil depth, there was no SCI produced; at 25 to 55-mm soil depth, the length of SCI increased with increasing of depth. However, the diameter of SCI and diameter and wall thickness of SCI xylem vessel decreased. Regarding hormonal concentration in SCI, GA(3) and IAA increased with increasing seeding depth, whereas the maximum ZR and ABA contents were observed at 40-mm soil depth. Similarly, the maximum rate of oxygen consumption was also observed in SCI of 40-mm-sown plants. Transmission electron microscope observations showed many mitochondria in the companion cell (CC) and many plasmodesma connecting CC and sieve element. As the seeding depth increased, values of the normalized difference vegetative index and shoot dry matter weight decreased but interestingly, the highest grain yield was obtained in 40-mm-sown wheat, followed immediately by that at 55-mm depth. It is concluded that wheat sown at about 40-mm soil depth may be optimal for winter wheat growth and production in northern China.

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