Using architectural analysis to compare the shape of two hybrid tea rose genotypes     

Ph. Morel  G. Galopin  N. Donès 《Scientia Horticulturae》2009

In the area of ornamental horticulture, it is necessary to compare individuals to assess the effect of an experimental treatment or to distinguish between two genotypes. This is especially true for the hybrid tea rose, a plant species widely used throughout the world as a garden rose and represented by a very large number of cultivars. Normally, this diversity is approached by a more or less subjective analysis of the shape, with terms such as upright or spreading, and compact vs. laxly branched. Even when evaluated by a panel of experts, this approach quickly reaches its limits when it is necessary to objectively quantify the differences observed. The architectural analysis proposed here allows us to satisfy this objective. Two rose genotypes were studied: Rosa hybrida ‘Radrazz’ Knock-Out^® (KO) and ‘Meiratcan’, Lovely Meilland^® (LM). These two genotypes share both architectural similarities and differences. As for the similarities: (i) the axes are of two highly differentiated types, long and short; (ii) the proportions of each type of axis vary from 100% of long axes for order 1, to 100% of short axes for the last branching order; and (iii) all of the flowering axes have a comparable profile, with the continuous development of their morphological components, from their base to their extremity. Despite these similarities, the two genotypes are very clearly differentiated. The number of orders and axes is greater for KO, whereas axis length and the number of metamers per axis are much greater for LM. The architectural analysis proposed here makes it possible to effectively quantify the major shape components of an ornamental plant like the rose. As a result, it provides a truly effective tool for objectively assessing plant shape.  相似文献   

结合知识图谱与双向长短时记忆网络的小麦条锈病预测   总被引：8，自引：6，他引：2  

张善文  王振  王祖良 《农业工程学报》2020,36(12):172-178

针对现有小麦条锈病预测方法没有利用病害发生因素之间的语义信息,存在预测难度大、准确率低等问题,利用知识图谱(Knowledge Graph, KG)和双向长短时记忆网络(Bi-directional Long Short-Term Memory, Bi-LSTM)处理多源异构复杂数据的各自优势,提出一种基于KG与Bi-LSTM结合的小麦条锈病预测方法。首先,构建小麦条锈病知识图谱,将与小麦条锈病发生相关的环境信息转换为特征向量;其次,利用特征向量训练Bi-LSTM模型,得到基于Bi-LSTM的小麦条锈病预测模型;最后,利用小麦条锈病数据库数据进行试验。结果表明,KG丰富了进行病害预测所描述的语义信息,提升了Bi-LSTM提取高层病害预测特征的能力,从而提高了病害预测的准确率。在小麦条锈病数据库上的预测准确率达到93.21%,比基于Bi-LSTM的病害预测方法提高了4.5个百分点。该方法能较好预测小麦条锈病,为小麦条锈病的预报预警和综合防治提供科学依据。  相似文献   

基于结构相似性的并联机构拓扑与尺寸同步设计方法     

王猛  林文琦  崔青春  宋轶民  孙涛 《农业机械学报》2024,55(4):431-439

随着并联机构从单一尺寸设计和拓扑设计向两者融合方向不断发展,基于拓扑叠加-再惩罚和全变量正交设计-再拓扑的同步设计方法得到广泛应用,但两者存在设计效率低等不足。为解决上述问题,本文提出了一种基于结构相似性的并联机构拓扑与尺寸同步设计方法,该方法拓扑优化时以相同质量保留此条件下尺寸参数小范围变化对拓扑结构微弱影响为切入点,通过拓扑结构参数化缩放和刚度-质量元模型构建,形成并联机构尺寸-拓扑同步高效设计流程。以典型3-P-RS并联机构为例开展算例验证与对比分析,结果表明,相同质量条件下,所提设计方法比尺寸设计方法得到的各向刚度更高,即拓扑优化使RS连杆的材料分布更加合理。  相似文献   

白背飞虱在玉米上的取食行为和发育繁殖特征     

陆佳浩  郭嘉雯  林培炯  胡高  翟保平 《植物保护学报》2021,48(2):348-356

为探究玉米能否作为白背飞虱Sogatella furcifera的过渡寄主,采用刺吸电位图谱技术对白背飞虱在玉米上的取食行为进行监测,并测定其取食玉米后的营养物质和繁殖力变化.结果 显示,不同生育期玉米处理组中,N4-a波和N4-b波的总时间分别超过37.88 rain和87.15 min,平均持续时间分别超过5.26...  相似文献   

邻域并和二分图对集的可扩性     

苏本堂  逄世友 《山东农业大学学报(自然科学版)》1998,29(4):457-460

图Ｇ称为ｎ－可扩充的,如果对于Ｇ中任意ｎ条边的对集都可扩充为Ｇ的一个完美对集。本文研究了图的邻域并条件和二分图对集可扩性的关系,证明了下列结果：设Ｇ是一个具有二分划Ｘ和Ｙ的连通的二分图,｜Ｘ｜＝｜Ｙ｜,ｎ是整数且０≤ｎ≤｜Ｘ｜／２。如果δ（Ｇ）≥２ｎ＋１,且对于图Ｇ的任意两个不相邻的顶点ｕ,ｖ有｜Ｎ（ｕ）∪Ｎ（ｖ）｜≥｜Ｘ｜／２＋ｎ,则Ｇ是２ｎ－可扩充的。  相似文献   

水库信息管理系统的总体设计   总被引：1，自引：0，他引：1  

刘东民  侯树涛 《东北农业大学学报》1998,29(2):168-172

阐明了建立水库信息管理系统的必要性,概述了系统的组成,着重完成了系统信息提取部分的设计,归纳了该系统的作用和意义  相似文献   

Inheritance of excised-leaf water loss and relative water content in bread wheat (Triticum aestivum)     

S.S. Dhanda  G.S. Sethi 《Euphytica》1998,104(1):39-47

Little information is available on the genetics of excised leaf water loss and relative water content in wheat. An experiment conducted on the F₁ generation from a half-diallel set of crosses involving two drought tolerant, two moderately tolerant and two sensitive varieties was initiated to investigate the inheritance of excised-leaf water loss and relative water content. This experiment was conducted under glass-house and field conditions at tillering and anthesis stages of plant development. Additive gene action, in general, played a major role in determining the inheritance of these traits. General combining ability (GCA) was the main source of genetic variation among crosses, while specific combining ability (SCA) was negligible. Strong phenotypic correlations existed between per se performance and GCA effects in the majority of cases. Heterosis was unimportant. Genotype-environmental interactions and/or differential gene expression appeared to account for different results found between environments and growth stages, respectively. Selection for relative water content appeared to be more effective at anthesis, while for excised-leaf water loss at both stages of plant growth. In addition to drought resistance, wide differences for morphological characters and relative positions of parental arrays revealed the possibility of obtaining desirable segregants for drought stress conditions from the cross Kharchia 65 × WH 147. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

豌豆蚜在6个不同抗性苜蓿品种上取食行为的EPG分析     

魏淑花  曹春婧  朱小芳  张蓉  王颖 《草业科学》2017,34(12):2569-2574

应用刺探电位图谱(electrical penetration graph,EPG)技术研究了豌豆蚜(Acyrthosiphon pisum)在6个不同抗蚜苜蓿(Medicago sativa)品种上的取食行为及不同苜蓿品种的抗蚜机制。结果表明,豌豆蚜在刺吸取食不同抗性苜蓿品种的过程中,均产生8种波形,8种波形在6个苜蓿品种上持续的时间分别不同。与苜蓿品种抗性有关的是豌豆蚜在苜蓿品种韧皮部刺探取食过程中产生韧皮部分泌唾液波(El波)持续的时间,在6个不同抗蚜苜蓿品种上刺吸取食过程中产生E1波持续时间差异显著(P0.05),抗性越强的苜蓿品种,E1波持续时间越长,在抗性品种MF4020上持续时间最长,为36.8min,在低抗性品种巨能牧歌37CR持续时间最短,为1.50min。本研究从电生理方面进一步说明了不同苜蓿品种的抗蚜机制,从而为苜蓿品种抗蚜育种提供了科学依据。  相似文献   

THE COMPREHENSIVE HYDRAULIC TESTING SET WITH A LOAD SENSING SYSTEM     

Wang Tiesun Yang Yang 《保鲜与加工》1988,(2)

This paper introduces the comprehensive hydraulic testing set for many kinds of hydraulic elements with hydraulic drive, hydraulic regulation and hydraulic loading. It has rational structure compact arrangement, reliable characteristics and advanced technique. In order to reduce the energy loss in the hydraulic system of the testing set, 1 ad sensing control is used. The static and dynamic characteristics of the load sensing system are analysed with the method of numeral simulation on computer. the testing witk load sensing control results show energy may be saved obviously and the heat load in hydraulic system may be reduced effectively, then testing quality is improved and the volume cf oil case is lessened. The lead sensing valve design is satisfied with simplifying structure so that it may be used reliably for the fixed flow hydraulic system of the testing set or other machines.  相似文献   

THE SIEVE GRAPH S(2m+1, t) IS HARMONIOUS     

Peng Taihua 《保鲜与加工》1993,(2)

Since Graham R. L. and Sloan N. J. A. advanced the concept of the harmonious graph in 1980. Many such researching papers are published. This paper constructs a class of the graph-sieve graph S(n,t),and proves that the sieve graph S(2m+1,t) is harmonious when n=2m+1.  相似文献