Root growth of wheat. I. Early patterns of multiplication and extension of wheat roots including effects of levels of nitrogen, phosphorus and potassium
Root growth of wheat. I. Early patterns of multiplication and extension of wheat roots including effects of levels of nitrogen, phosphorus and potassium
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小麦的根部生长。
DOI：
10.1071/ar9760183
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发表时间：
1976
影响因子：
1.9
通讯作者：
D. Tennant
中科院分区：
文献类型：
--
作者：
D. Tennant
在氮、磷、钾水平分别为标准、2倍、1/2和0的条件下，对小麦根系生长进行了30天的跟踪研究。根的数量和长度遵循一致的模式增加的种子和节的根系的所有治疗。大多数根组件表现出最高的相对增长率的长度和数量后立即第一次出现。在几天内，这降低到一个恒定的增长率，一直持续到实验结束。速率在恒定的相对增长的阶段，随着横向的顺序增加，和相同的所有处理，除了当养分不足严重抑制根系生长。缺钾在种植后10-12天内完全停止根系生长。氮、磷缺乏使根组分出现的时间随侧位顺序的增加而延长。随后，种子侧根数的抑制增加，节根生长受到严重抑制。较低的根数所造成的氮缺乏补偿较大的横向长度在种子，但不是节的根系统。氮、磷、钾水平减半或加倍时，根系生长量有所下降。所有的营养水平的反应更明显的增加顺序的侧根和与节点，而不是种子根系。节根系统比种子根系统更能反映植物的反应。
Wheat root growth was followed to 30 days from planting in wheat supplied with standard, twofold, half and nil levels of nitrogen, phosphorus and potassium. Root numbers and lengths followed consistent patterns of increase in the seminal and nodal root systems of all treatments. Most root components demonstrated their highest rates of relative increase in length and number immediately after first appearance. Within a few days this decreased to a constant rate of increase which continued until the end of the experiment. Rates during the stages of constant relative increase were higher with increasing order of lateral, and the same for all treatments, except when nutrient deficiency seriously suppressed root growth. Potassium deficiency stopped root growth completely within 10–12 days of planting. Nitrogen and phosphorus deficiencies gave increasing delays in root component appearance with increasing order of lateral. Increasing suppression of seminal lateral numbers and a severe suppression of nodal root growth followed. Lower root numbers caused by nitrogen deficiency were compensated by greater lateral lengths in the seminal but not the nodal root systems. Some reduction in root growth resulted from application of the half and twofold levels of nitrogen, phosphorus and potassium. All responses to applied nutrient levels were more obvious with increasing order of lateral and with the nodal rather than seminal root systems. The nodal root system reflected plant response better than the seminal root system.