Two types of vectors are used for the introduction of foreign genes into plant cells. Among them, the Ti-plasmid of Agrobacterium tumefaciens and a few plant viruses such as caulimoviruses and geminiviruses are the most important ones. Vector # 1. Agrobacterium Tumefaciens Ti Plasmids: Plants cells do not contain natural plasmids that can be utilised as cloning vectors. However, the [...]
Read this article in Hindi to learn about the tests conducted to identify various components present in the cell wall of plant cells. आप जानते हैं कि वनस्पति-कोशिकाएँ एक दृढ़ कोशिकाभित्ति से घिरी रहती है । कोशिका-भित्ति में अनेक रासायनिक अवयव उपस्थित रहते हैं उनमें से प्रमुख हैं- सेल्युलोज, लिग्रिन, सुबेरिन एवं म्यूसिलेज । इन अवयवों के अवलोकन हेतु निम्न [...]
In mature tissues, spaces frequently occur between cells. These spaces are known as intercellular spaces. The spaces may be small, large (ex. Canna)—called chambers and elongated—called canals. The spaces may be considerably elongated in one plane—called duct. The spaces are exceptionally well developed in aerenchyma of many aquatic plants. They form a connected system throughout the entire plant body. The [...]